Gregg,
While I'm waiting on the finish to dry I can give you a rundown on what I've done for a cart over the Smokin-It version.
I bought a 2' x 3' roll-around cart from Harbor Freight for $59.00. I also bought a couple of finish ready planks from Lowe's for $16.00 each. Some spacer blocks, hardware and varnish I had in my shop and bang! Smoker Cart.
I went a little overboard in some areas, but I think you can put a nice looking and highly functional cart together for right near $100.00 that will serve your smoking needs for years to come.
I hope to have this project complete by the end of the week, depending on how the two coats of varnish dry. It's been pretty humid lately. But it'll get there. Once I get it done, I'll post the pictures.
Dan