speaking very generally, the Judd V10 is a 94 mm bore ....the Aston is also 94mm bore, the bore spacing will be quite similar......so it will only be another pair of cylinders, so an addiional 100mm or so, which is not the end of the world, most of this could probably be accomodated in a slight wheelbase extension, or in a new gearbox design......I dont think it would need a new tub
speaking about encouraging GT1 runners into LMP1......I dont know why they didnt allow 7 litres to compete too, at this would be a good way to allow the gasoline runners to close the torque gap to the diesel engines......typically about 850Nm for a 7 Litre.....its a step in the right direction....
anyways - I agree, it will be interesting to see what aston eventually do