Had a few mins so decided to start the left door frame.
Installed the A post trim to ensure proper spacing, then double-checked the end clearance - Zenith says 5 mm each end, so I took a bit more off one end.
Placed the hinge over the door frame channel and identified the cut points. Removed the pin and cut, then deburred.
Positioned the outer gussets on the channel to mark where the rivets will go, since they can't interfere with the hing rivets. Marked, then marked the rivet spacing on the hinge.