Yes I understand the goal of the plan. In the 70s this was likely a decent plan. But as I said, in 2011, there are better ways to use dbol, and better ways to make gains over a 6 month period. I just see no reason to do this, other than as an experiment. If you do experiment with this it would be wise to make sure your liver isnt being negatively affected. 6 months is a long time even if only 3 months are spent 'on'.
If you would like to use steroids without shutting down your natural T production, you should look into Bill R's 2 on 2 off protocol. Its similar, but updated to maximize safety and results.