
It has two piano hinges...




In principle the heigh of the rolling column should be determined by the doorway of the room, but if it is not gtoing to go too often through any door it may be taller and pass any door a bit inclined.
Also a removable wheeled platform instead of fixed (pivoting) wheels as in the drawing would work.
My wild option would be no wheel at all and simply lay on the ground a folded blanket so one can move the colum on and push or pull.
The width or the height of the layout itself (not counting the wooden box) must be though so it doesn't get too tight for passing the doorway.
One could have a layout, say, 190cm long X 55cm wide X 35cm tall that, folded, would occupy only a footprint of 60cm X 40cm.
Again, if you have any questions, comments or critics I will listen with all attention.
Daniel