When it comes to building an A-D cab, one must take the position that one starts with a door and builds the cab to fit it.
I see a lot of spot welds in the outer cowl. Are they all welded up already? It would be really cool if they weren't. It would make it easier to move the cowl forward to give you more room for the door to fit.
Absolutely rebuild the hinges whether they need it or not. They do need it.
After you have rebuilt the hinges, remount the door. Leave the strikers on the work bench. They will only hamper the door alignment process. The latch is not supposed to play any part of aligning the door to the cab. The bottom of the latch is not supposed to contact the striker (only the safety catch contacts the striker upon closing of the door).
Bottom line is, you cannot properly adjust the door to the opening with the striker in place.
