When I had AMM come over and quote me on welding the new core support onto the front of my Galant, he took one look at the gaps I had (which were all less than 1/8") and he told me there was no way he would tig those joints like that. AMM, as anyone here who's seen his work will tell you, is a fucking artist when it comes to tig. We ended up plating over these imperfections on the Galant. In some places, the plates were slipped behind one piece and over the other to provide a flush surface with no gaps to be tigged. He actually forgot the welding rod and we used three wire coat hangers I had in the house to finally weld it all together.

Gaps =

EDIT: Link to pictures of AMM prepping and welding on 195. He wasn't happy with the quality of this project, but Captain Halfass told him it would be just fine for a spray painted car that will ultimately end up airborne in the desert before getting stuffed in a ditch.

http://www.dr1665.com/gallery/main.php?g2_itemId=1460