a friend of mine who does body work for a living uses a two part adhesive all the time with excellent results. he clamps and screws the panels on and usually grinds the screw heads off after because they are usually bonded in there as well. sometimes he will add a few tack welds for good measure so I dont se any problems welding the screw holes up if you can get them out. the biggest key is making sure the bonding surfaces are ground down well to good metal and clean clean clean.
Thanks, I am going to media blast it so it should be good and clean! Was thinking of making them myself, getting a bender and bead roller from HF but I still cannot make the dimples. Was thinking that a machine shop could probably make a basic die to create the dimples.
Maybe on the next one that my son builds.