You need to go
here to PreOrder the standard bulk HVL. And as far as it looks, you can still get in on the discounted preorder price too. But I would have to guess that is going to end any day now.
The monoblock will not work with the HVL chassis. The length of the HVL was designed to be equal to a Lightning/Thunder chassis with a monoblock anyways, so it's already extended, and there is no need for further lengthening.
He has mentioned that the production HVL's should be able to fit a 1717 or 1520 just fine. No alternative motor mount is offered or needed.
-Travis