I've read through lotsa posts about darkrooms and though I do admire a well built darkroom, the ones that seem to interest me the most are the "Guerrilla Darkrooms."
Here's mine, as food for thought...
My Classic Omega DII mounted on a Mac Tools bottom Toolbox (which houses everything needed to print with.)
I like it! A couple of issues which you may or may not have addressed concern me. First, is the top of that toolbox sturdy enough to handle the weight of the enlarger when the head is raised to the top of the column. The top of the toolbox looks kind of small for the size prints you can make with that thing.
The ones you get these days at the big box home improvement centers are not sturdy enough but a sheet of particle board could be used to stabilize them. This box is old and the metal on this one is doubled on top, braced in two places and thick. The usable work space underneath the lens is 17"X17" but I rarely ever print larger than 11X14, almost always use an easel and usually crop everything in camera. Haven't needed anything larger yet.
I might also mention that being a bottom tool box I find there's almost always a lip around the top edge to keep a top tool box from sliding off... If I were to buy a new one I would cut a piece of particle board to drop inside these lip edges and bolt it and the enlarger base to the top. That would sturdy it up well enough I reckon.