Updated.
Take a close look at the Oversized Maw feat in the underbar.
Shiny. This is what I had actually written up taking into consideration the LoM write up in respect to the aboleth's psysiology...
Swallow Whole (Ex): An aboleth can try to swallow a grabbed Medium or smaller opponent by making a successful grapple check. A swallowed creature takes 2d8+10 points of piercing and slashing damage from the aboleth’s esophagus. In addition, a creature that has been ingested by an aboleth is also subject to its memory siphon supernatural ability every round the creature is in the aboleth’s esophagus. A swallowed creature can cut its way out by using a light slashing or piercing weapon to deal 25 points of damage to the esophagus (AC 14). Once the creature exits, muscular action closes the hole; another swallowed opponent must cut its own way out.
An aboleth’s can swallow only 1 Medium, 4 Small, 16 Tiny, or 64 Diminutive or smaller opponents every hour.
-Changed the bludgeoning damage to slashing/piercing due to the teeth that line the esophagus.
-Eliminated acid damage due to being in the esophagus.
-Reduced creatures swallowed due to the slow movement of food down an aboleth's esophagus.
All the numbers I used were based off of similar creatures of a huge size.
You can ignore the *memory siphon* tidbit as that is my own brew's ability, but otherwise it looks like we came up with very similar solutions.
Bykov.