Has anyone ever invented a tent specifically for an up turned raft

I don’t actually hole far, I use my dirt bike and can carry 3 times as much as the average hiker. Weight isn’t a huge concern for me. I’m looking for a free standing tent, or extra large bivy that fits easily on the bottom of an up turned boat. I’ve found plenty of bivys that satisfy, but it’s be nice to have a little more head room. Have any of you any suggestions?