Nice rides! Drop in those motors yourself? Good work either way!!!
I too am in the process of changing my interior as well. I have the maroon interior and I hate it! My panels and trim will be going black. Trying to decide on either red carpet or black, same with the headliner.
The exterior of my truck is two tone, red on top and bottom like yours but with black through the middle.
Everything I read so far on several car forums is to use SEM interior colorcoat product with an adhesion promoter.
Cheers!