I need to build a doughnut turntable and can not find any info on how to build one. I have multiple turntables all are friction drive so I would like to do the same with the one that I have to build. Height is not a problem because I am inserting it in a 3' tall deck. Its od is 32' and its id is 18'. I would love to rent one but it would need to stay in the deck for 3 months and I do not think a rental would be cost effective. I am having trouble wrapping my head around what to build the inside hub out of. Any ideas or places that have info would be great.