I just moved/added casters last night, casters are now under each kettle. Thanks for the tip on the pumps, with the addition of a third burner in the center they will have to be moved anyways. I might install some discharge piping to at least have the ball valves higher than floor...
Here is my current build! Strut frame, chugger pumps. Waiting for a 3rd banjo burner for the MLT. False bottoms, and the cross style sparge arm (pic3) are all from Norcal Brewing Solutions ( good guys, awesome stuff).