Never myself but have heard of some boats, like a Carolina skiff, that have no longitudinal stringers but do have lateral and lots of foam. Read some stuff on some sites when doing some research a while back of folks designing and installing their own stringer system and attaching it to the transom. Foamed in between, ground somewhat flat and chop mat floor. If you have it all out you essentially have a blank slate to build as you please. Composite or wood is also up to you. I have the desire and enough smarts to build one but no space for a long term project like that. Let us know what you decide to do with it.