A friend of mine had a boat
similar to that he used to sail to local islands from Santa Barbara regularly. He was a pretty salty old salt
but he really enjoyed it and he wasn't in a hurry and he knew how to pick his weather
. He didn't even have an outboard
. I think it looks like a nice little boat
if you enjoy building things and enjoy the fruits of your labor. Yes, you could probably get a trailersailor cheaper, but you may get a great deal of pleasure out of building her that justifies the expense. And it will be unique and your own creation; there is certainly something to be said for that!
As far as performance, my friend's boat would chug along at 3 to 4 knots on a reach. The main thing slowing it down was just getting knocked around by chop, like going upwind. Downwind you may see it speed up a bit. So for trailering behind a 4 cylinder car and enjoying a nice afternoon on the lake, I say it's not a bad choice at all.