Very clever and simple stands! I looked at Amazon and only saw the T-slotted type but Outwater has the square tubing in silver or black anodized, and on the next few pages are the tap-in corners etc. http://www.outwatercatalogs.com/lg_display.cfm/catalog/Master_Catalog_Vol_42/page/204 Looks like all you need is some kind of jig to make square cuts, a hammer and saw. Cool! -Kent