The reason i'd like it to be bolted is so it can be disassembled and lifted without more equipment. It's also easier for me from a manufacturing standpoint.

Good suggestions on the irregularity. I'll do that.

I should mention that I'm more interested in HSM, not ploughing through plates with gigantic cutters - hence the 12000rpm spindle. I would put one of those high-speed ATC integrated spindles on it if they could measure up to the performance I would get out of the servo-spindle.