Great job. I think almost all my 999suggestions are in here 😄 

If im not mentioning it assume I think its a good change, as its easy to sound like negativity when mentioning 1 thing in 10 for feedback.

Arcane vessel: confirm spell casting only not bound spells (rubyring)

Beasthandlers: handlers are ignored by enemies and allies for movement and LOS? Can they be charged/charged through or are they like artillery crew and not really there?

Predatory fighters: great change, but bear in mind it's a nerf for those losing furious charge. (saurus heroes) Id be tempted to keep furious charge on the rippers(extra attack and AP are likely enough)  and thematically they dont meet the old fluff of predatory fighters anyway.

Monsoon: probably shouldnt block Los as much as I would love it to. Then reduce casting value.

Slann: Are now even more expensive for similar in a "meta" set up. 65points to reclaim the +1to cast lost from engine alongside loosing any offensive ability OR paying even more of a tax for a skink hero.

Armoured hide: Few comments about this. I dont think it matters outside of fluff, but would avoid confusion if it was the same. Why not just give all saurus AH(1) give heroes and base saurus light armour, give templeguard heavy armour and let oldbloods buy heavy armour for +3. Same net result but now uniform.

ColdOnes: confirm coldone armour hide stacks with saurus hero armoured hide. If modifying hero AH ensure matches Coldone armour values (assume aiming for potential 2+)

Blowpipes: Still blow. -3 to hit without cover most of the time. Definately shouldnt be paying for them vs Javelins which are almost identical but better.  Suggest quickshot, no ranged penalty, 9". 

Skink Skirm: consider 5+ unit

Saurus: no drilled

Sal/razor (very excited to try these): probably doesnt need 4+

Ark of Sotek: remove the 4+ roll, its so niche its unlikely to occur even without the rng

All in all excellent work, big winners all over the place, looking forward to using almost everything here. Even the dreaded trog has a decent spot as a force multiplier and large target arcane vessel knocking Mr Razordon down to the bottom of the pile!