Great idea, but I'm with Pottzy....buy some casters.  I have had all my tools on casters since I started 200 years ago.  There is a whole world to learn about them.  Material of wheels, double lock, single lock, plates or stem, and size.  do some youtube research and look at servicecaster.com...then put them on and be done.  Lately I have gotten some great deals on amazon tho....
While I have never had wooden casters, I had some steel ones once and they were miserable to move, plus I can't believe the wooden casters won't flatten....
I am just thinking that a woodworking magazine would be looking for projects for you to make...IMHO it is not a great idea...but just my .02

Mike