"Starting in a prison" reminds me of a campaign idea I've had for a while... but it's largely a dungeon crawl.

More to the point, the only time I DM 5e is when it's heavily modified. I'll join 5e games on occasion, especially with Gestalt, but anything I'd want to run myself doesn't fit vanilla 5e. So while I'm interested as a player, I am not the one to DM.