Do I need to prep and paint each piece separately?

Yes. Sand and prep each panel before applying your chosen primer and finish. This gives you control over color matching and ensures proper adhesion. Many builders paint off the vehicle for easier masking and a cleaner final result.

What's the gap filler situation between the new panels and existing body?

FRP panels align with factory mounting holes and are designed for minimal gap. After installation, check fitment before painting. Minor gaps can be addressed with standard body filler if needed. Verify panel seams match up to OEM body lines on your specific setup before final assembly.

Can I install this myself or should I use a professional?

Installation depends on your comfort level with basic hand tools and panel alignment. You'll need to remove existing components and align new pieces to factory mounting points. If you've done similar work before, DIY is feasible. For a flawless fit and finish, many builders prefer professional installation to ensure proper gaps and seam alignment before primer and paint.