I built a single tier system made out of keggles and galvanized angle. Mash Tun uses a RIMS tube wired to a PID controller and circulating pump switch I built myself. The HLT and Kettle are fired by 2 hurricane burners. I added a 2nd pump later but did not wire it to the controller. Plate chiller is mounted to the rack. Connections are 1/2 silicon hose with quick connects. This lets me move liquid in a bunch of different configurations.
Because the Mash Tun is electric and I added a 2nd pump, you can start a 2nd mash while boiling the first.
This is not it but it looks something like this. My RIMS tube and controller are mounted behind the mash tun. Have angle running a foot or so above/behind the keggles for hang things like paddles, hose, spoons, and stuff. Also have a water filter hung that runs into the HLT.
Told you I could run my mouth about brewing.