My Book Rebuilding Volumes forever

That version of WD SmartWare is quite old. The current version is 2.4, and starting from 1.3 the entire backup engine was changed. Try to see if the rebuild process on 1.2 is slow on any system as it could be a speed issue related to this particular computer. You could them restore the files into the external drive itself for a manual copy/paste.

Regards,