Some of the older D-IIs had a relatively small baseboard. I have one, and it's pretty manageable. I keep it on a rolling typewriter table and it rolls over the commode in the bathroom, fitting right between the vanity and the wall. It's as big an enlarger as I can manage in my space.
Before that, I was using a Graflarger with my Technika on a small copy stand for 4x5", and that was even smaller. If you've got a Graflok back on your 4x5" camera, you would just need a copy stand and the Graflarger and you can have an enlarging lens mounted on one of your camera lensboards. It's also nice to have a compensating timer, since the Graflarger backs don't have heaters, and are more prone to drift than modern cold light heads with heaters.