I did make it myself. You basically design what you want the unit to look like and order a rail and connectors. You'll then have to cut the rail to the correct lengths for your design, this can be done easily with a miter saw. Everything is attached together with special connectors and an Allen wrench.
Installation:
The 80/20 pieces have slots down the sides in which can fit a panhead screw(see attached). All I did was find a stud in the wall and screw two screws into the wall about 4" apart(you'll want to leave about 1/8 inch sticking out of the wall) and slid the mount down on top of them. I believe I used a #12 screw so the head was big enough to hold. The screw at the top should be approximately where you want the piece that extends over the tank to go.
If you wanted to tank mount the unit I'm sure you could; you would either have to build a hang on bracket or have something sturdy to screw into. 80/20 makes a lot of pieces and connectors that fit together so it's really up to your ingenuity.