make your own, free or very cheap vs 150$+. it's ultra easy, and fast.
but it's totally insane to use wood for it..
i would not use wood for it you can make one in alluminium for $20 with allt he connectorsa nd tube, don't need to risk to catch fire with wood, alluminium is much safer, just use plastic motherboard standoffs
Do you know where to get aluminum t-slots? I found a place online that sells kits, but it's like $180 a kit might as well buy one prebuilt (kit probably makes more than 1 rig but don't know)