I don't think you'll find a double slotted full span fowler hinge, but there are 1/4 and 1/5 fowler flap hinges that you could try and modify.

Best thing to do if you have the experience/time is to design your own, make your own, etc. Or, modify the ones in the link below. You may have already seen these Robart hinges, but just incase you haven't:

http://www3.towerhobbies.com/cgi-bin...LXMRN6&P=7

Not much else I can think of for what your doing, so good luck.


Jason