I've written up my body outline and started in on that. Due to the compat break, I'm starting with support for basic di/polymorphism for creatures and moving on to creature/plant material lists (including all of the extracts and whatever else). I've set aside three more days for this right now (and obviously more later, since I won't finish in three), but the order after mats is roughly: tissue layering, body part relationships (encasement, relative position, etc.) and sizes (and some new parts like teeth, claws/nails, lips, ribs, hair, etc.), improve the attribute system a bit, do appearance phenotype-like stuffs, size information, and then with that backing, get into wounds properly without having a simple placeholder first, then healing/scars (and thus better pain handling), and then descriptive paragraphs (not just for wounds but the rest too, which will further individualize everybody, hopefully in a satisfying way).
When extracts come up in the separate material lists, this'll probably invite an expansion of the venom/poison system beyond the current stun/paralyze setup. Going over to explicit materials for tissues will probably also lead to a replacement of the damage blocking system (and probably thereby a sort of insane-yet-proper increase in challenge for creatures like iron men that'll have to be matched by more tactical options over time).
As a result of tissue layering, the 15 HP per BP system is being more or less dropped to make way for individual wound tracking. Unless you look at the specific descriptions, you'll still have wounded BP lists and so on displayed in pretty much the same way, though. Aside from having more accurate combat text (though I'm not sure if that's coming with this push) and the scars/improved healing/pain management that come from wound tracking, it also means that smaller creatures will be able to cause very slight wounds to large creatures in many cases where they'd do nothing before. A 1 out of 15 guaranteed BP HP drop is too large in many cases (thus the current no-damage chances), but adding a scratch to the skin tissue doesn't have to count for so much. So even if you aren't really hurting the titan, at least you can make little marks on it and bother it or something.
Well, subj. It seems like perfection in 'damage department' is getting withing reach.