Keep building. I heard the IM plan would be out by the end of this week. *crosses fingers*

You've definitely been doing your homework this winter, great to see! The first thing to take into consideration is over training. You need to be careful right now. How do you feel? Tired or good to go? If you're tired, finish up the 8th week of your current Build plan, which is basically an active recovery week. Then, you can jump into Traditional Base for 6 weeks to bring all of the body's systems back up to 100% before jumping into the new 8 week Specialty plan and repeating the 7th week so the 8th week still lands right before your event so you taper effectively.

If you're not feeling tired and want to keep going, I'd still recommend finishing up that 8th "active recovery" week of your current Build plan but then it gets a little more complex:

- First 3 weeks of Specialty Plan
- Active recovery week
- Repeat last 4 weeks of Build plan (final week is active recovery)
- Complete entire Specialty plan

This way you are still getting pretty substantial rest and recovery before you take on the full Specialty plan, but the training is adequate and fitness will still be increasing throughout the entire process.

Also, it'd be very beneficial for motivation and for practice/preparation to find a smaller race to target somewhere in between those 16 weeks.

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Professional Mountain Biker and Community Manager at TrainerRoad - Cycling's Most Effective Training Tool