We are actually making our mounts modular. The concept is to have 2/3 piece mounts all the way around. This would allow us to run an isolator in-between (read polyurethane) for street cars, or a solid insert for race applications. As you mention, that will also have the added benefit of being able to adjust drivetrain height in relation to axle centerline which I didnt even think about. Awesome point.
I would like to offer this package as a full conversion if I get all the details squared away, so I am trying to think a few steps ahead haha