here’s a semi-hijack.
I read another thread some time ago about a suggestion to glue the stiffener on before cutting out the doors. yes, lots of in-and-out thru the transom while getting the chamfer on the stiffener just right. then I contemplated how to fasten the stiffener to the door while the epoxy cured.
I cut two pieces of scrap, about 2″ wide, long enough to span the length of the stiffener. I drilled 2 1/16 inch holes in either end, located so the holes would line up with the CNC cutouts for the door cut lines. then using cleats on the outside, I used some steel 18 ga wire (thinking it would pull up tighter than copper would due to the strength of steel). from the inside of the camper, I threaded the wire thru the two holes in each end of each stiffener, poked them through the CNC slots, then got out and threaded the protruding wire thru 2 holes in each cleats, and twisted it tight. it cinched tightly enough to squeeze the extra epoxy out of the joint as it should. I have since cut the doors out, have installed the window sills, but haven’t yet fit the doors. hopefully the doors have held the proper angle shape after cutting. we’ll see!