I have four shelving units with adjustable shelves
66-1/2" x 36"
73-1/2" x 41-1/2" - sits on a drawer box that can be removed/transported/installed separately (20-1/2 x 41-1/2")
60-1/2" x 30-1/2"- this one sits on a longer piece and (cabinets/pull-out drawers: 16-1/2" deep, 97-1/2" long, 24" high)
Two more are ~43" wide x ~95" high. These ones have angled tops but could be modified for a flat ceiling (95" is shorter end of angle). Also these ones are built up a little bit (~4") and that could be reduced for a lower height.
They are painted white (solid) wood fronts and boxes- not melamine- and seem to be of good construction (not dovetail but really well put-together and not loose or anything)
We are doing some renovations and thought I'd see if I could save any of them from the landfill