Without getting into a discussion on chainline or Q-factor, just thought I`d mention that those adapters that hold the external bearings can have threaded sections of different lengths.

In fact, the more high end you go, the more likely you`ll be to find more thread on the drive side because thats where more spacers are expected. So since you`l have to torque those goodies down to between 300 and 400 in-lbs, it might be worth confirming that you`ll still have enough threads left on the non-drive side to take that kind of torque after stacking three spacers on there. The people that designed this stuff were expecting one, max.