Lol, I heard that somewhere before too but decided to google anyway. In any case ive never seen one in person but I did see this today. (absolutely zero to do with a Morgan)
I'm not quite sure about the Aero, but I know that the other cars, the plus 8, plus 4 and 4/4, are all made with ash frames on metal chassis. They are, in my opinion, beautiful examples of traditional British sports cars, especially the plus 8 and plus 4. My father had a vintage plus 4 in the 70's that he loved. Said it was one of the funnest cars he ever owned, with the exception of his Triumph TR6. Although he always talked about how stiff the suspension was, apparently there was a joke about Morgan's that if you drove over a nickel you could tell if it was heads or tails.
Only problem is they don't use pressure treated frames so they tend to rot, just like car frames should be galvanized but evidently the extra $300 it would cost is too much.