I'll be dipped in sh!t, I've thought about using caulk a few times and just never did it. I bet that went in there pretty darn well around those engine gaps.
I like that effect with the NMF Doogs, this will be my first time using Alclad (got a good deal on some from a LHS in the Windy City). I'm going to use Aluminum and Magnesium, hope it's not too much of a contrast.
Some wip pics