Hah ! Necessity is the mother of invention.. my Skyslab Ob sits on suspended repurposed pallet flooring. Shed was cheap Chinese knockoff and rest of timber is tanalised fence palings, 1800 X 150 x 25.
Carpet, yes carpet, came from our office refurbish leftovers as do the several old PC's and screens. Plus other fittings.
Have fun inventing ... pics ARE required ...
EDIT: And the pier is a 10" concrete sewer pipe stood on end and filled with cement !! Priceless !!