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[Zapeth]

Thats very interesting, I'll try to look into some formats myself though I'm currently pretty busy so it might take a while for me to do.
Also after a quick look it seems like there are a _lot_ more file formats in the overall game (like LFT, BTZ (config files for the game?), PSQ, CDP, etc) but I guess we should focus on the levels first?

There's also one level file format that you didn't mention, TFX. I guess thats some additional file to TEX?

Anyway, some things that come to my mind which are missing for the level would be Sound information and AI related things (though I don't know if thats included in the racing line information).