Would you be happy with rectangular one? I made mine that way because I only plan on hitting it one way. ie, round is a waste of wood, IMO. If I make them round I'll need to haul my bandsaw out of my mom's basement, which I have no idea when that'll be. I reckon if I do make any I'll sell them for about $100 for a rectangular one. The wood alone for this one ran me about $65. Plus labor is a bitch. The real problem is I wouldn't know your swivel and wouldn't be able to sell you the proper mounting brackets. To address these issues, I was thinking of making a couple and selling them with a swivel included, that way it would come with properly drilled holes. It would be up to the buyer to find a way to mount it. But I have an idea for that, too! I'm working on it and have to go price a few things. I'm also looking into different woods and paints, even epoxy coatings for durability.

All said and done, maybe $125-150 or so for one that would easily destroy pro platforms that go for several hundred. Give me a few days to research some options and my costs to produce them.