"they build it like they did in the 1930s, so I might get 1930s unreliability for 2010s prices"
There were no electronics in those days....so your doors would open and close ok and be locked with a key! Windows would be wound up and down with a lovely manual winder...usually quicker than an electric one.
It's damned annoying when things go wrong with a new car...and not only one as expensive as yours. I doubt if any more care is taken in building a £100K Morgan than a 4/4. A friend of mine bought a Plus 4 from the factory at the same time I got mine... he had some potentially dangerous faults with it which took quite some time and a lot of angst to get sorted out by the factory. They did eventually bend over backwards to sort it out when they realised how dangerous the fault was. But it has muddied my friends relationship with the car, the factory and his local dealer...the latter who was no help whatsoever.
Don't let it put you off the car yet. Hopefully these faults will be sorted out for you and allow you to enjoy the car...from your previous posting you obviously felt that the car was pretty special and made you feel good. Hang on to those feelings!