If you happen to luck on to an old graphic arts copy camera, either horizontal or vertical, these can be adapted for enlarging. I'm thinking the smaller vertical type would be easier to handle, having a smaller footprint. Often the copyboard would have a transparency unit under the copy mat, uncovered you could make a print on fast paper with no modifications to the camera, simply place the negative-which could be up to 16x20 size- onto the copy board and put the print paper on the vacuum back inside the camera and expose it. I used to use these for a living so I can attest to the ease of use. Many of these were autofocus design and most have a ground glass you can drop into the place of the vacuum board for critical focussing.
Wow check out the link provided above. The cameras this guy has made up in the bush land of Ontario is amazing! While not the easiest to use I'm sure, it goes to show what a true craftsman can do, both mechanically and photographically.