I think the painted roof is an excellent idea. With all due respect, the red hash stripes doesn't work because you've added a 3rd color that's totally unrelated. Also, I'm not a fan of vinyl on cars. I do like your idea of the 2 color white with black detailing theme..
I am having my hood stinger stripe painted in Carbon Flash Blk.
By the way, I see the P51 in the photo. Do you fly RC? I have attached a photo of my '51. No vinyl decals on it either....all paint.