Desiring placement flexibility and the ability to expand LP storage as the need arises, I DIY'd the 16"Wx15-1/2"Hx12-3/4"D stackable modules shown below using Home Depot-purchased alder. The sides are 1x8's biscuit-joined to 1x6's; the staggered top and bottom slats are 1-by ripped to a 2-1/16" width. To provide additional stability, I added 7-inch-wide 1/2" thick plywood backs to each module.
An unintended but welcome bonus--a VPI 16.5 RCM fits snugly atop a module. Three modules are shown stacked, but I currently have seven in service, including a solo one for the RCM, with the cleaning and rinse solutions and related supplies stored inside it.
I'll add an oil finish to them one of these days.

