Yea, but we have to wait for the Prusa i3 30" before we can print the wheels...

I like you base idea. I cut squares of rubber from an inner tube, folded them and placed them in 6 spots under mine. It made it quieter, reduced vibration and keeps from sliding when I move the bed around. Maybe I'll do a base then put rubber feet under that. The rubber is a great noise dampener and shock/vibration absorber.