To answer the question @Nate asked in the OP, for Polarized plans, I recommend fewer recovery weeks since there are generally 1-2 rides with intensity (100% FTP or greater) each week, versus 2-3 plus one sweet spot for the current TR plans. So, for the 6-week plan I recommend 5:1.
I understand that Seiler recommended 4/8/16-minute intervals, and I agree with TR’s approach that their first POL plans use his recommended format. However, my understanding is that anything above LT2, which is approximately 100% FTP, is considered POL Z3. Therefore, TR could use the VO2 and Threshold progressions from the current Short and Sustained Power Build plans and substitute the weekend rides with POL Z1. Here’s my attempt at a Sustained Power Polarized Build (SusPPB) plan and a Short Power Polarized Build (SPPB) plan. Something to maybe file away for future POL plans as they evolve.