Tonight I made some minor texture fixes, and then ran through chapter 3 as much as I could given time limits.
I vid-started S'pht'ia on kindergarten and then played through until repeatedly dying early on in She Is The Dark One, then vid-started She Is The Dark One and kept dying early on in it again, so I think the combat on that (and Let Sleeping Gods, too) needs to be tuned down some, but I'll leave that to someone else.
Vid-started S'pht Happens and played through to Eat S'pht And Die, played through to Second to Last of the Mohicans, got lost and was running short on time so bailed out and vid-started Third Rock from Lh'owon. Repeatedly died early on there too and so quickly gave up on it, but pretty sure I confirmed that the landscape textures are correct now. Vid-started and played through Flight of Icarus with no problems.
Noticed numerous little texture issues throughout and fixed them. (Except for a whole freakin' bunch of those weirdly misaligned doors, which I'm starting to think are caused by a Vasara bug, because there's some textures adjacent to platforms in Icarus that refuse to stay aligned either). Changed the fog on Eat S'pht And Die to black instead of orange for the same reason it was changed on Second to Last of the Mohicans (orange looks weird with the night landscape). Distributed all the physics changes across all the levels.
All of that's up on git now.
And Eternal X 1.2 beta 3 is up now too.