I cant see it being that involed like you say it might be. Most of these bikes chassis are usually built on the same principal design for the same model. The way I figure, a VN is a VN, just bigger suspenison parts like you said to accomadate the heavier engine. But how much more could it weigh? Maybe 50lbs? I think if I were able to get measurments of a VN1700 Mill, and take the vn900 Measurments, it mat shoehorn in. It may even use the same mounting locations, who knows. Anything is possiable, I think that would be a badazz ride. All the Power you need in a mid size bike that is compact and easy to manuvere and ride, and be able to blast down the turnpike at 80-90 MPH all day for touring trips. Now that wold be the best of all worlds, how come they cant make a bike like this to begin with? It seems you sacrifice comfort for style, style for power, and power for price. Hey Kawasaki, are you guys listening?