Not to persuade you to one method or the other - just adding ideas.. although the Rockwell F106 is indeed centered, it can be altered. You would just need to make new axle shafts for when you cut/modify the axle housing.
Heres a couple links of companies that deal with F106 axles:
https://www.gearheartsgarage.com/app...1131508?page=1
http://www.trbmachine.com/