I just finished my gravity 3-tier brew tower and I thought I would share. I gave it a few test runs before painting it, and there wasn't anything that I wanted to change, then had it sandblasted and painted it with HVT FlameProof header paint. It runs with two BG-10 burners and 0-30 psi regulator with a 20 gal MLT and 15 gal MT and BK.
I guess the pictures say more than I can. I based my design on the Morebeer design, plus a few modifications from some that I saw on here, and then some tweaks of my own. It's solid, highly mobile, and works great.
Let me know what you think!