The PLL route does include LMS PII non corridor coaches, but not a Kirtley 1F or a Prince of Wales. PLL has nothing to do with TANE, the intention of course is that it will run under TANE and that any updates needed will be distributed through a support website.
As it's not possible to test PLL with TANE (I can't even run TANE on my hardware) we can't foresee how easy this is going to be.
Paul