I know they don't have to be very high... the drawing is exaggerated. With Code 55 rail and standard cork, the hinge axis would need to be above 0.225" from the base. I'm looking at some interesting Euro-style cabinet hinges I found for inset doors that might do the trick with the hinge completely below the bridge. We'll see how the experiment goes. Between lift vs. drop, I'm more in favor of lift, if I can make it work, as I don't want to mess with the more complex support on the far end for the drop. I considered a lift-out, and used one for the closet door where it will be operated less frequently, but I think a hinged design is better for this area.