Understand completely!! I'm going to take your measurements to a local shop here in town and see what they would charge to fab some up with heavy hinges also as I have been following this thread hardcore lol !!
Probably a couple hundred for the material, cutting, and bending.
I'd have them do the smaller tabs though. Those GSA-style are YUUUGE!
BTW, don't go by the measurements written on the tabs, the dimensions are actually a bit different than that.