That's a good idea - but I don't think my neighborhood is gonna appreciate me paddling around on a plywood-topped air mattress lol. I might try one of these boats with a plywood cutout to set in the bottom if I need extra stability. I'd probably duct tape the edges of the plywood to avoid punctures. My biggest fear is tipping the thing by changing the weight distribution as I set weights etc. I suppose the bigger the boat the better.
I gotta side with Bing on this...To recap... got a rubber boat (or blowup mattress), plywood insert, duct tape, bigger the better....only thing missing is a gas powered leaf blower to propel it around the pond. Tim the Tool Man would be proud! (Even more proud if you dropped an inboard/outboard 289 with dual carbs in there)
Please take no offense Mirak, hope you have a sense of humor.