A £60k to £80k car built in low numbers with some design flair (which I think we all admit it looks like this car has in buckets?)
Playing the devil's advocate, it is hard to tell this from a CAD generated profile - which to my mind looks like a LIFECar / Aero amalgam; therefore, I cannot admit that it has 'design flair in buckets.'
Personally, I hope it deviates from the AM Rapide school of design - take a car (in that case the DB9) and stretch it. While Morgan will follow, and rightly so, the Aero design language, I hope they move it on. Imho the SS has done little to do this and my hope is with the EvaGT, we will see the next generation of Morgan. They have a talented designer and a lot of heritage to work with.
I apprecaited and acknowledge that The SS is a different kettle of fish as it's price point is higher still. However that was 'justified' to me by the additional costs of producngvthe moulds for the new superformed shape? Whilst I have no idea how accurate that is, ie how much of the £50k increase in cost over the S4 is attributable thus? BUT it does go to show the problems faced by a small manufacturer these days.
Based on the above, how likely is it that the EvaGT will be less than the SS? For the reason you state above, and while I would love to see an Aero 8 S4 price point, I believe it will be challenging for the company to achieve this. They have the chassis to work with but it isn't inconceivable to imagine that most of the body panels will be new. That, before you even take into account the development of seals, glass, etc, will be a massive investment. The upside is that the ROI on the SS needs to be achieved in a limited production run - investment divided by circa 250. In the case of the EvaGT, with some luck, they can spread the investment over considerably more units.
As a comparison, it would be interesting to know what the Lotus Evora 2+2 production numbers per annum are and what level of investment LC Ltd made. The Evora, is probably the closest comparable to the hypothetical question that BtG posed.