These 'full size' boats were built from free plans available online. Both are under 8 feet so that they can be built from standard sizes of ply. Not much bigger than models, they are relatively easy to build. Minimax (blue and yellow camo one) featured watertight compartments and was pretty much unsinkable even when the seating area was totally filled with water, as I found out when I gave my friend a shot by himself while I waited on an island, he managed to fill it to the brim plunging bow down into a wave near to shore. Try as we might, we couldnt flip it up to get the water out. We had to ask a guy that was frying his lunch if we could borrow his frying pan! 10 minutes later we had got enough water out to tip the rest out.
It carried 2 of us with no problems, amazing for such a small boat.
Minimost was a development of the minimax but didnt feature watertight compartments, so I filled its nose section with expanding foam. It was good fun as well but I was always a bit worried about it sinking. Both boats used my evinrude 9.9 outboard, built and restored from 2 very dead engines. I had to buy some extra bits but it ran without missing a beat.