Replying to Summer setup landing idea?

Alright had an idea last night. For my summer setup I’ve got ample speed so I was thinking an up rail with a few feet of drop to a landing would be dope for working on bigger spins off. So for the landing, I was thinking about finding an old free mattress, putting an angled piece of wood underneath it and then covering it with a tarp that can get soapy water put on it. Do you guys think a tarp covered mattress would be satisfying to land on or is the cushion totally pointless? Anyone tried something like this?