I read all of your posts, and wanted to say thank you to all for your suggestions. As a beginning woodworker, I'm worried about trying to create something that takes me too far out of my comfort zone... but I'm definitely willing to try.
I thought about buying a kit from HF, but to be honest, the wheels are what I think would be the problem for me. My garage floor isn't great ... not terrible, but just not the smoothest of surfaces.
I've decided to build my own base out of 3/4" plywood (two layers thick for strength) and use heavy duty casters from Home Depot
. They're 3" wheels, and the total height is 4" for the unit. (I have the 4" wheel versions on my workbench and a cabinet that is a catchall storage area. They work great, and their brakes are STRONG!)
Add in the two thicknesses of 3/4" plywood, and I'm looking at a height gain of 5.5 inches. It's definitely going to be taller than I'm used to, but I'm 6' 1", so I should be okay. If it feels too high, I'll see if I can modify it somehow, but I really do think I'll be alright.
I'll try to take some pictures as I go and post here later... or at least a picture when I'm done.
Thanks again to all for your ideas!