Well I can make a base like that also. More cost to thread and make the jam nut. I am waiting on the screws I ordered to mount mine today.
I was going to mount my base close to the edge so it won't be as much in the way. I guess there is a 100 ways to skin a cat.
I wanted to make mine so they would break down and store in as little of space as possible. And no tools to fall in the lake or have to keep track of. I could make the 2 seat deal two. I don't know about how cheap it would be. I don't see how some of these guys do it.
I am buying american material and paying AMERICAN wages. And that will never change. I will go out of business before I SELL OUT.