I made my cowl installation such that 2 pin sections were used and installed through the oil access door. I flew like that until I started breaking eyelets. At that point, I removed the hinge and replaced it with Skybolt fasteners. A much better solution in my opinion.
If you are committed to hinges, I would recommend going to an extruded, rather than formed hinge. It will be much less likely to break eyelets. In either case, as I recall, you will need hinge stock made for 1/8" diameter pins but use a 3/32" pin to make the tight bend radius.
Skybolt fasteners are the way to go