Ok, I see what you are saying, a lot of stuff can be assembled then painted as long as it's going to be the same color. What if you are assembling say the engine, a chevy engine's block, heads, pan, etc. will be chevy red/orange, so you can assemble those and paint the assembly, but the exhaust manifolds will be steel. Do you go ahead and assemble them onto the heads, paint it all, then go back and hand paint over the manifolds and the other small parts that are a different color?