The chief problem with stainless was that if someone hit you, you had to replace the panel. Paint covers Bondo...
I had an opportunity to drive one once, without any foreknowledge of what to expect. It was really awful. If this gentleman is really going to assemble and sell 300 more copies, he should seriously consider coming up with an engine swap that puts some life in the car. An electric power steering system might be a good idea, too.