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Do you have the equipment for fabrication? Most anything can be made with a saw, a drill, a few files, and some simple hand tools, but I must admit a plasma cutter, couple of grinders, and a belt sander do make it much easier.
Photos from this thread, although you might not be able to see it without opting in.
http://www.scubaboard.com/forums/solo-divers/370472-fish.html
What is the problem? All I see is different companies making a product that looks the same. Are you basing the height of the tank on the cam bands?? For me I base the height of the cylinder per the top bolt hole, as this will keep the valve in the same horizontal plane as my doubles. My OMS STA has the top cam band over the top bolt, just where I like it because my double bands are in the same position. All I do is put the cam bands about a 1/2" under the start of the cylinder shoulder.