You have 16.5 weeks to Mellow Johnny's. I recommend starting the 12 week Weight Loss and Base training plan now (start 11/21/11) and following the complete plan.
On 2/13/2012 start your Cat 2 Build, Peak Race plan. That way you will have 4 weeks of intensity training under your belt by the time you race Mellow Johnny's March 3-4.
I didn't understand your comment “only start training on the 6th of december? ” If that is a deal breaker you will need to expand and explain that to me.
Lynda