Real PDP11 model question

How big is a PDT-11/110? My PDT-11/150 is quite a bit larger than a DECmate III. To the best of my knowledge the smallest possible PDP-11 made out of real hardware would be a 4-slot dual-height backplane, with a dual-height CPU (ideally a PDP-11/73), DLV-11J (providing console port), 3rd party disk controller w/bootstrap (preferably SCSI). That would leave room for one additional dual-height board. You'd have to figure out the power-supply and how to wire up any disk or tape drives. I'd build something like this, if I had the backplane, but I don't. The smallest DEC PDP-11 that I'm aware of is the PDP-11/03, but you've got to add a external drive of some sort. For people where a system the size of a BA23 is an issue, your best bet is going to be to simply run under emulation. In my case it isn't the size of the systems so much that is an issue, it's how much space all the documentation I have takes up!