Steven Tate
CEO Flat Forehead Soc.
Thanks to the OP for posting detailed parts list. I am finally in the mode to build a similar rack, and I'm using his parts list. I ordered everything today from 80/20. Paid more than splitting the order, but laziness overruled cheapness today. I added six adjustable leveling feet, which totaled around $70. For those who want to know what all of the metal parts cost from the one vendor, it was a tad under $350 including shipping and the added feet. I plan to make both sides mirror images with a top, bottom and middle shelves. I'm going to use pre-veneered plywood with Red Oak veneer for the top surfaces. I will glue and screw a 3/4" veneered piece of plywood to a non-veneered piece, for a total thickness of 1.5". To finish the edges, I will use solid 1 X 2" Red Oak glued and screwed to the main board with Kreg Jig screws so they are invisible. I may use a double thickness of the 1 X 2 Red Oak trim to get the 1.5" I need to match the thickness of the legs. This eliminates the need for precision cutouts, and should make an interesting looking top surface when sanded, stained and varnished. The six adjustable feet should give plenty of support for heavy amps and receivers and be easy on the floor, I think there is enough height that I could reposition the shelves and add another shelf to each side later on. That's a nice benefit of the 80/20 system. I really like the OP's plan and look forward to getting this built.
Steve
Steve