If you're looking for an off-the-shelf solution, R&J Enterprises makes a few different 36x18 stands, with the Eco-Modern model being the cheapest. It's made of wood and 3/4" plywood, vs. laminated filler and/or staple construction of stands you'll find at Petco and the like, and is very solid. Comes in black. Looks decent. Mine cost me $221 from my LFS. Certainly a fair bit more expensive than the metal one linked above, but it's a proper stand and will likely cost you less than having one custom made by a woodworker.