I don't know how close the DB9 and AMV8 will be but as far as I know they are based on the same platform but it will differ in each, the aluminum VH platform invented by Bez has the characteristic that it can be easily be modified in its dimensions for the different models but without mayor chages in the production chain. So it will be tailored to the AMV8 differently than in the DB9, but its a way to save costs for such a small company like Aston while allowing them to offer a more varied model range. So the AMV8 may be quite diferent in the end to the DB9, though its pure speculation in my part.