Hello Colin,
This would make a good first boatbuilding project. It has much in common with the Benford dories, and is probably the quickest and easy type of hull to build. Starting from the same stack of plywood, you could build a better boat, but only with more investment of time and skill. I prefer a five-sided, rather than three-sided hull, like the one I drew for Annie's SibLim, but I hesitate to suggest it as a first building project, otherwise I could scale down SibLim for you.
The flat bottom makes the settee lockers more usable than with a round bilge, and in combination with the faceted, not cambered, deck gives you headroom over a wider area. She will carry enough to be independent of the shore for a few weeks, so long as you are happy with a minimalist lifestyle. I have been comfortable aboard Weaverbird , a boat of the same length but lighter displacement, for the four summer months, but I would need a warmer climate overall to spend longer aboard full time.
The inclined topsides make it a little more difficult to keep the fenders in place, when lying against a pontoon, if that's important to you.
This design of rudder proved unsatisfactory on the Benford dories, and in this size of boat, you have to make the most of the length. Noting Paul Fisher's willingness to make changes, I would ask him to draw a vertical transom and extend the bottom to meet it. This will increase the sailing length and she will carry a load more gracefully, with less immersion of the transom. The rudder can then become a simple vertical rectangle, and there will be less load on the tiller.
As to the rig, we can probably help you towards a form of JR with better handling and performance, if you decide to build.