If you include the dozen or so pages in the bestiary section that are strictly art and/or lore, it's 80 pages - very respectable.
I've read some more of the Stronghold Actions and Class Feature Improvements. I feel some need clarification, and some I will definitely tweak for my own game.
The Fighter's Class Feature Improvement is neat, but unclear.
Class Feature Improvement: Fighting Surge
Whenever you attack by using your Action Surge, you automatically score a critical hit. You can do this for a number of surges equal to your stronghold level, after which you must take an extended rest to refresh this ability.
So, I like that it keys off of Action Surge, but is it supposed to turn every attack you make when you action surge into a crit? One attack per surge? When you specifically take the Attack action when you action surge? I mean, you don't technically attack with your Action Surge. Anyway, I don't expect the wording to be just like WotC's, but slightly stricter wording would be better.
My take on that Fighting Surge ability is that you can score a critical hit on a number of attacks equal to your stronghold level. Each critical counts as one use. Because a fighter will only ever get two action surges at level 17, and strongholds can be higher than level 2. I could be wrong, but that's how I read that.
There are a couple of instances like this where things are a little unclear based on the wording. Nothing drastic, but I've noticed some already. Matt also seems to not adhere slavishly to the WotC terminology....I see references to "Attacks of Opportunity" instead of the 5E term "Opportunity Attacks". That's very minor, obviously, but there may be other examples where it's a bigger deal.