I appreciate @Weeble's comments and want to add (all of this is IMO of course):
- I cannot comment on the Seahorse shipyard, having only had conversations with Stella but had not visited. However, the 2nd most popular shipyard for DD construction is Asboat in Turkey, who I did visit and discussed builds. Regarding to QA/QC, their carpentry was absolutely top notch. However their steelwork was so under par that I walked away. Actually, the other thing that made we walk was that I asked them to build me a DD to a workboat finish, not a yacht, but their price barely quivered.
- Regarding to sail is more of a "get somewhere" vs "get home" that is accurate and was specifically George Buehler's intention. The truth is that mechanical diesels are so reliable and so easy to keep going, generally just related to keeping your fuel pure, that few ever need get home home power. Just ask Richard on Dauntless about his position on this matter and he crossed the Atlantic. George's philosophy with sail assist was that it is better be moving downwind at 1 knot than to be sitting dead in the water. Personally I agree with this and today's get-home engines are generally so over powered that they could literally act as the prime movers.
- Agree about the limited utility of a DD design. I'm not a flybridge guy and there was no visually-acceptable way to have a hard covered deck, an outside covered "patio" if you will, which would suit my wife and I. Also, even looking at big 60ft versions I could barely get the interior layout to suit us. I was under contract to buy Ellemaid (Hooligan) in Singapore, the big 70 footer. But even at that gigantic size it still suffered these same problems, plus it was a true motorsailer ketch, not a get-home sail assist.
- Yes, the DDs were originally intended to be affordable, practical cruisers which any man could build and afford. They are wonderful designs, if they suit you.