Ok Dave, I’m attaching a ton of pics as I think that’s what you need for ideas. 1st, you will never find an off the shelf top to enclose the back deck. That’s assuming that you intend to not just do a top but also side and back curtains? Anyway, you will need to have it custom made. I didn’t go all the way back on my top but I think how it connects to the cabin via a dogger is part of the concept that might help with your idea? My top does come out to the edges of the drip rail on the walk around and we could have added side and rear curtains to it but that’s not what I was looking for. Hope this helps.