The early ones didn't have such bins so authenticity suggests not using them. If you want to go ahead, though, they are made mostly of 1/8" plywood or board with an internal frame of 3/4" square Doug fir or pine. At the back and side the frame is screwed through the paneling into the camper's frame, and at the top it is secured by 2" metal L-brackets also screwed into overhead frame members. Brackets should be spaced every 2 ft or less. I added lights to the underside of the bins to illuminate the galley area. I've thought of redesigning the overhead bins to simply be shelves bounded by coarse webbing or dowel risers because as it is, it's a little hard to see what's inside the bins, especially for short people. If you use doors on the bins, they should be hinged on the bottom side so they stay open while you're searching inside.