You need that angle to bend over the transom for strength.I did one and took the aluminum half way down the transom were the motor bolts/clamps on.
I’ll second trapper’s recommendation on tinboats. There is a lot of good info over there and some cool builds as well.I personally would want plenty of flotation in it so I would replace the foam under the seats. As DonJuan said, keep digging. I did a little rehab work on our pond jon a few years ago and got some good info over at tinboats. Haven't looked in awhile but it might be worth your time.
Good info. Where do you buy marine plywood?transom work sucks. don't cut any aluminum as others have said, it's necessary to have that lip for structure. don't use pressure treated plywood either, it'll corrode the aluminum. marine plywood and some sort of penetrating oil and a top coat then slide it in mark your holes and drill them out then treat them as well and then assemble. stainless steel fasteners only.
A few places in St Charles have it in my area. Lumber stores typically have it or can order it, big box stores won't know what you're talking about I'm betting.Good info. Where do you buy marine plywood?