Chris,
good work as usual, but am surprised you are not making your door stiffening "frame" from metal tubing with your hinges welded to it, as well as the door lock. The nature of the 917s doors makes them very vunerable to weather-human-unforeseen "abuse".
I know you are doing your own thing and not following originality, but the doors can be a right pain for keeping "tight" so to speak, and with you wanting to put it to road use I can,t help thinking that just GRP ribbing will not really be sufficient, especially when pushed against rubber weather sealing strip or tubing.
Good work though.
Thanks for your feedback Graham, did try the alloy tube route, took me a morning to get the front door section bent, it fitted ok but was not happy with it so opted to try the moulded route, I hope to use Carbon/Epoxy for the door itself then the stiffening rib with flanges will be from carbon too. I am hope full that the shape should give it the strength around the inside edge of the frame. I shall use alloy for the crossbar which the door catch/lock is located.
Will suck it and see, no great loss if I have to revert to alloy/steel tube just a few days wasted. I will try the one door and see how it comes out before I do the same on the other side if successful!!!
Hoping the light and stiff approach should work!!!
regards C