Lol, they're not necessary Jim. If I were making them for the OEM car then I'd agree. But, since they're being made for a custom application, it's in the application phase where as a builder we have the opportunity to affix the doors in the position we need them via welding.
Moreover, once my hinges are bolted up, they need not be unbolted for removable because I made it so the shaft that joins the two halves of the hinge together can be removed.
-Jayso