All I did to mount the hinge was grind two small notches for the original hinge blots to sit. Nice and solid, no need to weld any for the hinge. I did need to bend the hinge slightly to get the lens to sit right.
The welds are ugly....I was having problems lol. The filler is mounted using a strap of 1/8 steel and then the strap is screwed to the bed. The filler "bucket" is just mounted to the filler, not screwed in at all, but it fits good and solid.
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Could you let me know what vehicle you got the doner parts from for the gas flip door, bucket and filler pipe? Thanks!