That looks very nice acdii... the fabric hinge seems to work just fine, but you'll have to make sure not to get any dope in the weave where it flexes... small magnets would work as well to hold the door open... on my H9 super cub there's a magnet imbedded in the wing sheeting, and another in the actual door / window frame... very strong, and it holds it open while flying with no problems... its a clean and invisible way to hold the door / window open.
John M,