Urban,
These are nice boats, if somewhat dated designs from the '70s when double-enders were fashionable. Some were sold as bare hulls/decks and owner-completed, so you need to keep that in mind as you look at these.
Also, my understanding is the moulds were later licensed out to a UK boatbuilder called "Victoria", who built some versions (see, e.g.
Victoria 30). The Victorias were generally less expensive than the full-blown Morris version. The home-built caveat may apply to the Victorias as well -- but I'm not sure on that.
Ferenc Mate, in his now dated book "Best Boats to Build or Buy", reviewed the Leigh, along with several other Morris models. If you can find a copy in your local library, there might be some helpful info there.
As much as I like the look of double-enders and canoe sterns, I am not a huge fan of them in boats this size. It just seems like too much hull volume is lost, and in a size range where you're trying to get as much as you can (within reason) in a compact hull. Of Paine's Morris designs from that era, I prefer his 30-foot "Annie", which has a more traditional stern and fuller hull sections in the aft end. Quite a bit more hull volume in the same length.