Yeah it's a long butt weld seam, but I used an aluminium block to back my welds to help with heat and burn thru since it's accessible from both sides all the way around. I cut oversized on the AMD outer wheel house and than clamped the quarter in place to locate the new AMD outer piece to the original outer tub. I then clamped the piece to the quarter and used sheet metal screws to hold the new outer section to the old outer with about 2" of overlap. Once that was done I removed the quarter and took a 1/16" cutoff wheel and cut thru both pieces to give me a perfect gap for a butt weld. If you go to my resto thread and check out between page 10 and 16 I have a lot of additional pics of how I did it.
I don't think welding is a problem as long as you seam seal inside the wheel tub. Glueing might be tricky in this area since it goes in behind multiple panels and is a structural part of the car.. It's where your roof structure ties into the wheel well tubs and down to the rockers.
