BrickUnderground

I am looking for recommendations on custom "murphy" or wall beds - I am trying to find a hinge frame that can be mounted to the wall, not the floor and not in a cabinet (we do not have sufficient wall space to allow for a cabinet, and I don't really want to mount the hinge on the floor).  

I am having a hard time understanding the "wall bed kits" that are available - has anyone had experience with these "wall bed kits" - are these beds stable?