I am actually buiding a combination of the two, singel tier and multi tier. I do not have much garage space, but the celings are 15 feet. So, going up minimizes floor space and utlizes the head space I have.
Still running 3 pumps
-HLT recirculation to reduce Temp Stratification and to deliver Mash Water (240V/4500W)
-MLT and RIMS pump (110v/1500W)
-BK CIP and recirculation pump for CFC and delivery to conical and O2 stone tee (210K BTU Bayou)
It looks more like an HLT moutned above Mash tun and then BK and MLT in the same level. 4 feet square, 7 feet high. I do all this now in a setup that is 4 feet high and 8 feet long by 2 feet deep.
This can all be done by the Blichmann Tier system, or other suppleirs out there of extruded AL structural framing, or, as the other poster stated, a friend that welds.