You could find many furniture companies that will build to order, or find a company that does a similar product and see if they can change an existing design to suit your requirements (that was what I did). Try someone like these guys - Sydneyside furniture
Also, personally I wouldn't want a cabinet that was easy to move around on wheels if I had a large TV sitting on top of it. You would have to really be careful when moving it even if you have the TV secured to the cabinet top.
Edited by diesel, 16 April 2011 - 08:58 AM.