If you just can't think of how to make the bones though, I say you might as well make the skin, if that's what's coming to you most easily. You CAN stuff the bones, muscles and organs in later, and if the skin rips in the process, just make some new skin It may not be ad efficient as an inside-out process where you don't risk having to remake the skin bc it got ripped, but it's better than not starting at all XD
Maybe he's legit just fine with general answers, even if he doesn't respond to them or hit the like button. I say just give general answers like you would if this thread was started by anyone else, and if he wants more specific feedback, he can ask for it.
Oh hecc, in this case I guess I do have a first draft after all XD I've always thought of myself as having an outline plus some scene drafts but not a draft for the whole story; but yes absolutely; don't be afraid to just literally write down your intentions verbatim
(I've said something similar when it comes to summaries/descriptions for your series; if you can't write a nice/'official'-sounding, 'blurby'/'prosey' description, just write down your intentions verbatim; that certainly describes your series well enough for me to see if it's my thing and check it our if so XD)