Along with all of the other answers, I'd add that I'd "recess" the
casters, i.e., mount them on sort of an L-bracket, so that you only have
to raise the base of the press maybe 1/4" - 1/2", rather than 4 or 5
inches.

________ BASE _________
\_/ | OF | \_/
/ . \ | PRESS | / . \
\ _ / ------------------------ \ _ /
------------------------------------------------- floor

Rich, you clearly don't have to deal with a space-limited shop. The above design
is great for stability but it really burns floor area. I wish my press were
smaller, but it's the size it is, and I don't want it *any* bigger.

GWE