How to Customize Your Gundam Kit: Kitbashing and Scratch Building
By Neko Alley Anime | Published: 2026-08-20
Category: How-to Guides
Learn how to customize your Gundam kits with kitbashing and scratch building. Discover techniques, tools, and ideas to create your own unique mobile suits.
Building a Gundam model kit straight out of the box is a rewarding experience, but customizing your kit takes it to a whole new level. Whether you want to create a unique variant of your favorite mobile suit or build something entirely your own, kitbashing and scratch building are two of the most exciting techniques in the Gunpla hobby. In this guide, we'll walk you through the basics of these customization methods, from planning and sourcing parts to painting and finishing your masterpiece.
Customizing your Gundam kits not only makes them stand out on your shelf but also allows you to express your creativity and technical skills. With a little patience and the right approach, you can transform a standard kit into a one-of-a-kind creation. Let's dive into the world of Gundam customization and explore how to kitbash and scratch build like a pro.
What Is Kitbashing?
Kitbashing, or 'kit-bashing,' is the practice of combining parts from multiple model kits to create a new, unique model. In the Gunpla community, this often involves mixing parts from different Gundam kits to create a custom mobile suit with a distinctive silhouette and armor layout. For example, you might take the legs from one kit, the torso from another, and the backpack from a third to build a completely new design.
The beauty of kitbashing is that it allows you to repurpose your existing collection. If you have spare parts from previous builds, you can use them to enhance a new kit without spending extra money. It's also a great way to breathe new life into older kits that you may have built years ago. With a bit of imagination, the possibilities are endless.
- Start by planning your design: sketch out your idea or use photo editing software to visualize the combination.
- Check part compatibility: some kits have similar connection points, but others may need modification.
- Use plastic cement or putty to fill gaps and make parts fit seamlessly.
Scratch Building: Creating Parts from Scratch
Scratch building is the art of creating custom parts from raw materials such as plastic sheets, rods, and putty. Unlike kitbashing, which uses existing parts, scratch building allows you to design and fabricate entirely new components. This technique is perfect for adding unique details, custom weapons, or even entire sections of a mobile suit that don't exist in any kit.
To start scratch building, you'll need a few basic materials: polystyrene sheets of various thicknesses, plastic rods and tubes, and putty or epoxy for shaping. You'll also need precision tools like a hobby knife, sandpaper, and a cutting mat. With these, you can create everything from custom shoulder armor to a new beam rifle.
- Practice on simple shapes first: flat panels and simple cylinders are great for beginners.
- Use templates or blueprints to guide your cutting and shaping.
- Sand and polish your parts to achieve a clean, professional finish.
Essential Tools and Materials for Gundam Customization
Before you start customizing, it's important to have the right tools and materials. At a minimum, you'll need a hobby knife, plastic cement, sandpaper, and a cutting mat. For more advanced customization, consider investing in a pin vise for drilling holes, a scribing tool for panel lines, and a set of files for shaping plastic.
You'll also need a variety of plastic materials: sheets, rods, and tubes in different diameters. These can be purchased from hobby stores or online. Putty is essential for filling gaps and creating smooth transitions between parts. Finally, don't forget about paint and topcoat – these will give your custom kit a polished, professional look.
- Use a hobby knife with a sharp blade for precise cutting.
- Plastic cement is essential for joining parts securely.
- Sandpaper in various grits (400-1000) will help you smooth surfaces.
Step-by-Step Guide to Kitbashing Your Gundam
Step 1: Choose your base kit. Start with a kit that you want to customize, such as the Gundam ZGMF-X20A Strike Freedom Gundam HG 1/144 Model Kit or the Gundam XXXG-00W0 Wing Gundam Zero Gundam Wing RG 1:144 Model Kit. These kits offer excellent articulation and a solid base for customization.

Step 2: Gather donor parts. Look through your spare parts bin or other kits for interesting parts that you can incorporate. For example, you might take the backpack from one kit and the shield from another.
Step 3: Test fit everything. Before gluing, dry-fit the parts to see how they look together. Make adjustments as needed, such as trimming pegs or adding spacers.
Step 4: Modify and attach. Once you're happy with the fit, use plastic cement to attach the parts. Fill any gaps with putty and sand smooth.
Step 5: Paint and finish. Prime your kit, paint it in your chosen color scheme, and apply a topcoat to protect the finish.
- Keep a notebook to document your build process and ideas.
- Use masking tape to hold parts in place while the cement dries.
- Don't be afraid to cut and modify parts – that's the point of customization!
Scratch Building Techniques for Beginners
Scratch building can seem intimidating, but starting with simple projects will build your confidence. Begin with small details like custom vents, thrusters, or sensors. These can be made from plastic rods and sheets, and they add a lot of visual interest to your kit.
As you become more comfortable, you can tackle larger projects like custom weapons or even entire armor sections. For example, you could create a custom beam sword from a plastic rod and a clear piece. The key is to plan carefully and measure twice before cutting.
- Use a ruler and a scribing tool to mark precise lines on plastic sheets.
- Heat plastic rods to bend them into curves – use a heat source like a lighter or heat gun with caution.
- Practice on scrap material before working on your actual kit.
Painting and Finishing Your Custom Gundam
Once your kitbashing or scratch building is complete, it's time to paint. Start by disassembling the kit and washing the parts with mild soap to remove any oils. Apply a primer to help the paint adhere, then spray or brush on your base colors. Use masking tape to create clean lines for multiple colors.
After painting, you can add panel lines with a fine-tip marker or a wash. Finally, apply a topcoat – matte, gloss, or satin – to protect your work and give it the desired finish. A matte topcoat is popular for a realistic look, while gloss gives a shiny, anime-style appearance.
- Use thin coats of paint to avoid brush strokes or runs.
- Let each coat dry completely before applying the next.
- Topcoat in a well-ventilated area and follow the manufacturer's instructions.
Gundam Customization Ideas to Inspire You
If you're looking for inspiration, consider themed builds. For example, you could create a 'desert' version of your favorite Gundam with sand-colored armor and extra storage packs. Or a 'space' version with darker colors and additional thrusters. You can also combine elements from different series to create a crossover suit.
Another idea is to create a 'weathered' look by adding battle damage and dirt. This can be achieved with dry brushing, chipping, and washes. Whether you prefer a clean, showroom look or a battle-worn aesthetic, the choice is yours.
- Look at official Gundam designs for inspiration, but don't be afraid to deviate.
- Join online Gunpla communities to share your work and get feedback.
- Experiment with different color schemes – you can always repaint if you don't like the result.
Customizing your Gundam kits through kitbashing and scratch building is a deeply rewarding aspect of the hobby. It allows you to create a unique piece that reflects your personal style and skills. Whether you're just starting or have years of experience, there's always something new to learn and try. So gather your tools, pick a base kit like the Gundam ZGMF-X20A Strike Freedom Gundam HG 1/144 Model Kit, and start building your masterpiece today!



