Don't really think it's over engineered ,very handy for us in suburban areas,it looks like it might be tight on space with a mutley etc,but a great idea,is there room for the TV,then I can move in.
Call me old fashioned but if he had a shed with a door at either end he could ride in, get off, walk out and shut the door. also if he had the room for this he would have room for a wider shed that he could get 2 bikes in or sit in the dry and fettle with it. It is a nifty solution to a non problem if you ask me (and I agree its over engineered - imagine getting the base to slide in after a couple of years when its full of dead leaves)