This is my set-up. Did it in the backyard because sun.
Six hours later, this is the completed frame. No shelf boards or top yet, and it turned out the casters I bought are too large for the posts. I'll have to add them later.
Here's the completed product! The marble top came from the discount room in a local antique store (actually built the island around the top, so that it would fit properly on top). It weighs about sixty pounds, so I didn't actually attach it with anything (there's also an inch overlap on each side)
Now that I have it in the kitchen, I kind of like it where it is. I might leave the casters off for now. It still needs prettied up (paint, some paneling maybe), but I'm leaving that up to the wife. ;)