Interesting that you paint parts at different times. I would be worried about being a different shade when you bolt it all together!! It's coming together
I always do.
Not really enough room to get everything comfortably in at once.
I'm obviously using the same batch of paint so as long as I apply the same amount of coats using the same technique everytime, then it's all good.
Metallic and Pearls are better painted at the same time however with metallic, as long as the same technique is used, the results will be consistent.
Ben