Mine is setup in an outdoor garden shed. Made from such cheap pine, it leaks light hence having to hang up dark out cloth. 8x8 doran fan and vent on opposite sides keeps ventilated decently enough but is getting a bit warm in midday, even setup in shade of tree. It works but....
I can disassmble if I need to use the bldg for something else. I'm using an Omega 5XL and seems rigid enough screwed to top of workbench. Leveled it once and haven't checked it since.
Just finally recieved a pristine condition Schneider 150mm Componon S and back from abroad finally. Excited about enlarging first 4x5 neg lol