With how diy it is, I'd be tempted to just roll some paint on. I saw someone do it on an old car and it didn't look half bad. Since you can take the panels off it might be pretty easy.

Edit: I tried to find a video I saw about it many many years ago, it might have been the first guy to document it, because I seem to recall it being a wild idea at the time. But apparently the rustoleum roller paint job is super popular now, I had no idea! There's a million videos on YouTube about it, seems like.