Hey Ben What is the complicated part about that bracket? No dis respect meant! Does it sit in the door jamb, will it be visual all the time? If it's just there to stiffen up things, go to town on a piece of plate, draw out a nice simple triangle, maybe use some other triangle from your shop if you wants to make another for the opposite side) add some inches to the two sides that are 90* in angle to each other, make the sides in a size you can bend over in the vice. And bob is your uncle. This is not a restoration, this is a hot rod.