Give the Culebra from Jacks plastic Welding a consideration, super light, highly manuverible, very stable for it's size. You can row it with a standard raft frame, get the cargo slings and do short multi day's, and it even breaks down into luggage sized pieces if you ever wanted to fly some where. Plus Jack builds quality stuff in the USA.
I have a scrap of plywood cut just shy of the floor size, that I stand on and is solid. I don't even have to strap it in, the thwarts make it nearly impossible to come out, unless maybe I flipped and popped my thwarts. Then I guess I would be out a scrap of plywood.
"Everything is written in the book of nature. This book is always open."