Made these hinges after mocking them up with cardboard to check the swing. It was critical that the door move away from the cowl area when opening. I got some 50mm x 10mm flat, bent a right angle into it and then welded a machined tube onto it. That accepted the 10mm shoulder bolt, which acts as the pin.
The internal housing is 75 x 75 x5mm modified to suit the A pillar. I set all this up on a steel plate at the original hinge centers and then used a long pin to line the two up to stop binding
Then cut the A pillar up to accept the hinges
Made a press die to make the hinge covers.
Permanently welded the housings to the A pillar.
Both sides were done at the same time. With these completed, the doors can be tackled next