I want to close mine in by using part of an old 1st gen 4runner top. I need to take some measurements and see if the size will work.
If the 4runner top doesn't work I might take it to a place that makes canvas canopies for boats etc and see what they would charge to make a custom soft top. Or get a big piece of canvas and see if I can stich something together myself.
Whatever I do its gonna be easily removable though, because you can't beat the open air feeling in the summer