But can it go sideways?
A sofa with mecanum wheels capable of moving in all directions was built by some Australian University Students including several FIRST Alumni( from team 3132) with assistance from the University of New South Wales.
http://newsroom.unsw.edu.au/news/sci...botic-makeover
Not all the parts were FRC targeted COTS or legal parts, so it is fantastic that your have been able to build your sofa with FRC parts.