Raising the Bar is a mod based off of the idea of amalgamating the earliest concepts of Half-Life 2 into a coherent story. This mod is not a leak-fix, nor is it a concept art recreation gallery; it will be a full story with inspiration from the old material as well as our own ideas of how to make it all fit together.
Cvox's blockout of the Antlion Cave's exit.
I imagine the Antlion King will make his appearance in these caverns.
For some reason I think that the Antlion King technically would be great boss if it was made as something like Kraken from "Tomb Raider: Underworld". Maybe some extremely detailed/scripted mapping would make it possible if developers have plans on indluding/recreating Antlion King in the mod. But that would be very time consuming.
We do have plans to include the Antlion King, but there are higher priorities at present. As to how we will implement him, well that will take some testing to figure out.
Sounds great. Good luck with it. I see you've got lots of assets to be done before moving deep into mapping and stuff.