Welcome to TM.
Others summed things up very well.
As well as long doors, a car with a galvanised chassis, superform wings and a stainless steel bulkhead will be less expensive to keep nice.
The best advice is to go to both a Noggin and to see Brands Hatch Morgans.
You may have a perspective on the motor trade. In the Morgan world, the long established dealers are very good and most of us have a favourite one or two - usually based on geography (but not always!).