I for one am good with just about all of this. A find familiar spell that turns his spellbook into a floating papery head full of ancient knowledge? That's just all kinds of uniquely awesome!
That said, my biggest concern is Graydon sending his spellbook off to pick fights with people all the time; putting the source of a wizard's magic on the frontline seems a pretty risky proposition under any circumstances. What happens when Shandrizar winds up losing a fight? He goes comatose, and Graydon can't prepare any more spells because all the arcane equations he needs to impress upon mind and soul have been riddled with stab-holes.
I'm still thoroughly interested in working with this idea, but you can bet that Graydon's 4th-level cantrip choice will be Mending.
Cool, glad the dialogue was fruitful and the character works for you!
Well, there is the versilimitude question about what happens when a Spellbook is stabbed, chopped, and burnt? How much is legibile after that? Personally, it's a question I think we can mostly side step because HP are abstract for characters already. If we need to narrate the damage physically, it can be damage to the cover which is made of the hide of some mystical beast, rather than the interior pages. I imagine we can handle corner case scenarios (e.g. submersion) as they crop up.
Well, healing spells should work on him just fine.
And I believe that he's usable as a spellbook even while 'dead.'
So Graydon should be okay...
He could always use another spellbook later, if it becomes a problem, and just copy spells from the sentient one. Much to that book's annoyance I imagine.
Yeah, the idea is if Shandrizar gets reduced to 0 HP he is out of the fight until Summon Familiar is cast. On the downside, that means no healing spells can bring him back from "unconscious", and he won't naturally recover from that state. On the plus side, a level 1 spell - Summon Familiar - effectively operates like Raise Dead on him (or actually better than Raise Dead cause there's no time limit for Summon Familiar).
And yes, the diminished archmage would be insulted if Graydon took on a second "traveling" Spellbook, and would certainly deride the book on its inferiority even if it were a one-sided conversation.
[MENTION=20323]Quickleaf[/MENTION] Great work, as expected.

I don't see anything that would prevent you from joining the party right now, and I can think of a few ways to hook Shandrizar into the plot going forward. I do think you could stand to be a little tougher for a tank, so I will still put an offer for some added durability options on the table. Exact details still to be determined, but I didn't want to hold off on posting
Thanks

Yeah, I think it makes sense for me to begin posting in the IC thread when Graydon consults his Spellbook, the group takes a short rest, or they visit a library, or something along those lines. Hmm, let me read the last couple posts and see if the timing is right.
EDIT: I left the backstory open-ended for DM mischief, but I am happy to provide further details if needed / desired.
As for durability (AC & HP), his HP 27 is about on par with a level 3 fighter with CON 14, and his AC 15 is on par with a fighter wearing a chain shirt & shield/Dex 14, or half plate & Dex 10. So perhaps his AC is lagging a little, but on the other hand he can deal 15 damage on his turn, which is on par with a level 3 fighter with DEX 18 dual-wielding scimitars. Hmm. If you want to give him a +1 AC bonus, I am cool with that, though I am not sure it is necessary, especially since it only takes a 1st level spell to revive him (not to mention Second Wind). IMO The real boost in frontline effectiveness comes when you take the Sentinel feat.
[MENTION=6776473]Pembinasa[/MENTION] Well, if you and [MENTION=20323]Quickleaf[/MENTION] don't *want* healing spells to work, then they don't have to.

Discovering the secret of higher-tier
repair spells (like the ones from Eberron) could be a quest unto itself, though I daresay a spell like
fabricate could be made fit to purpose.
Yeah, cure wounds & healing word both say they don't work on constructs or undead. I guess if I'm benefiting from other construct traits like not needing to eat, drink, breathe, or sleep, then it's only fair that I be treated as a construct for the purpose of these spells too. If that's the approach we take, then that extra +1 AC you offered sounds a lot more enticing
Another idea, to rip off Planescape: Torment, are unique healing methods that can only be used by certain characters. For example, maybe spell scrolls can be consumed to heal Shandrizar, or maybe a visit to a local bookbinder replaces the clerical services usually offered at a temple, or maybe certain rare components (inks, powders, gilding) could be used as a healing kit on him. Just a thought.
Similar idea could apply to Picayune, the effigy.