I believe the OP is looking for a tool chest/ work bench cart. Not a robot cart, Given that I'd recommend checking out MOE's (365) pit set up. I believe they have their CAD models and material lists posted on their website.
340 Build a battery/ bumper cart, that works really well. Its basically just a two wheeled dolly, with some added compartments for batteries and bumpers. One of the huge benefits of a system like this is when your testing or practicing in a gym you can easily wheel down the whole cart of batteries and plug them in. If all your chargers are contained in the work benched you have to wheel down and set the whole system up to be much use.
I can't find a great picture of the battery cart. But i've attached what i have if you want more information I can get you in touch with someone.
https://www.facebook.com/photo.php?f...type=3&theater