2. I am also in the design phase of my 2 or 3 tier sculpture.
What have you decided on doing with your rig? I'm in the beginning stages of planning one myself.
I'm thinking of just building a rolling cabinet to store everything. I can put a cooler MLT on top and gravity drain it to a keggle. I'll use the keggle as a BK and as a HLT. I'm pretty sure I can do this with a minimum of equipment (no pump) and space.