I have access to aluminum, and the tools to bend/weld it. I'm building a raised platform area under the seats on my Hydrasports. Entirely of aluminum. It's MUCH lighter than wood. But it isn't very tall-3" or less.
I also want to put a deck extension on as well. Again I can use aluminum, but I'm not sure how to build the frame work without it weighing a ton.
For those with simple drop in extensions, what is holding the extension up?