If I were you I would measure the machine that the unit is in and make it similar to the machine. Most machines will be the same. Dont worry as long as the lines do not bend enough to kink you will be fine. You will be surprised how easy these mechs are to handle. The lines can bend quite a lot before any damage is done. I just make a bottom piece with plywood and then make the sides out of two pieces of 2x4's that are about 14" tall and another piece of plywood at the top. I have one made out of scrap. It doesn't look good but it works. there is nothing to it. All you need is a circular saw, some wood and about 15 minutes and you have a compressor stand.
Awesome! You know behind the wall my machine is on is a wood shop with a table saw, wood lathe, drill press and other stuff. Should be able to get one made pretty quicky.