I have a trap door of 2×6’s which is part of a deck(to crawl space) it measures 53w x 46 deep and weighs probably 80-100 lbs. I need to be able to lift it and it will be cut it in half, inserting flush to deck handles on both doors, under the center of the doors a 2×4 or 2×6 with hangars each end so when the door is closed it rests on center beam so it doesn’t cave in. Similar vision as a Bilco door. I need hinges that are flat with no hinge sticking up to trip over and am having a hard time finding it. Can anyone help with hinges that will allow the doors to fold back flat on the deck. Thanks.