Why don't you save the cash, and just leave your board on a benchtop? There are countless materials you can use if you want to make something like a plastic "table top" where you can screw in multiple power supplies, motherboard(s) etc...
Check out McMaster/Raw Materials/Plastics/sheets-bars.
You can get a 24 x 24 x 1/4" thick sheet of Polyethylene (bullet proof glass) for around $40 and make mounting holes for a motherboard, and make some adapters for hard drives and power supplies etc. Its more fun and way cheaper then any case. Plus there is no chance of grounding out anything.