I've just got mine on a little table in my bedroom, which is just big enough for the enlarger and trays. All the wet side fits in a cabinet in my bathroom when not in use, and the enlarger can stay where it is as a "permanent" installation.

Currently running it as a completely stock setup with the 3-element lens. (Can't remember the name of it off hand.) Been thinking of getting an El Nikkor as they seem to be available fairly cheaply online & I have heard from numerous sources that seems to be a "quick win" as far as improving quality of the prints.

What's the advantage of changing the head?