Mick, The boat above is 1/32nd scale and, back to your thinking, the cost was a bundle of wood strips and a plan. Apart from the oars, which are bamboo skewers, everything is made from the same strip wood. The real cost was in time, it took me around three months of spare time to put it together. As I was working at the time, on a ship, I figured my time was better spent putting that together than it was watching rubbish videos in the evenings!
Then of course, because I used the original kit rowlocks, someone once told me it wasn’t a proper scratch build! There’s always one.