I wouldn't nesecarily condemn the winny if your planning on cutting, but 12 weeks of winny is pushing it.
If you load up on liver protectants (milk thistle, r-ala, Tylers liver detox, etc) you can do it...but as always there are still health concerns. Ultimately it is your decision.
I think your goal is a bit far out there. You want to drop 10% bodyfat and possible go up 30 lbs. Its jsut not going to happen Be extremely happy if you can gain 10 lbs and drop 5%. This would be more realistic and obtainable