Brokenhead, a previous owner has already patched up the filler neck hole in the cab. The guy isn't changing a lot from stock on the truck, just little touches like this, a/c, and a drop axle setup.
Bart, did the filler neck catch the bottom of the bed so that you had to notch the wood, or did it exit below the floor line? The one he had a pic of just caught the edge of the floor so they had to fab a guard for inside the bed.
Fab work doesn't scare us, it's what we do.