Time found for updating
Lizard Lord Working Draft.
I'm tempted to give it Chew and Improved Grab in lizard and hybrid form too - it still has the same natural equipment, just at smaller scale.
e.g.:
Chew (Ex): While in lizard, giant lizard, or hybrid form, the lizard lord deals automatic bite damage every round it maintains a grapple against an opponent smaller than itself.
Improved Grab (Ex): To use this ability, the lizard lord must hit with a bite attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If the lizard lord wins the grapple check, it establishes a hold and on the following round it can chew its opponent or, if it is in giant lizard form, attempt to swallow its foe.
The Swallow Whole can remain a Giant Lizard only ability.
We need to set some damage numbers for Swallow Whole and figure out the gizzard's AC and hp. The gizzard gets half natural armour, but does it get all the lizlord's luck, divine, insight, and deflection bonuses? That'd give it an internal AC of 48.
I'm not sure how you'd apply an insight bonus to the Armor Class of your own stomach - guess I don't have enough insight! Maybe it can see inside itself and knows when to hiccup to throw off an attack?
Hmm, checking the Draeden it looks like I figured out the Gizzard AC correctly at 48 (or, at least,
consistently) since that has the gizzard get full insight and divine bonuses.
For the damage, I guess bite damage (4d6+14) from crunching muscles plus, say 2d6+4 acid?
A tarrasque's stomach acids do 2d8+6 acid, a dire shark's 1d8+4, and I guesstimate the Lizard Lord somewhere inbetween.