Well done author.

Working with VLDB requires one to step back and take the time to think it out.  While there may be other ways to go about the operation and get simullar times yours is nice for the two reasons you state in your article. 

Rollbacks are small by using batches, and by following the order of the clustered index you assist SQL in a orderly writing to the data file. 

One 125 hour roll back can only force us all to start working and thinking about SQL server in this way.

Thanks loved it.