The Ship Single Player: Creating Chapters
From Valve Developer Community
You'll probably want to use this article as a more thorough reference of a similar task.
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cfg\chapter#.cfg
Intro/outro maps only need a map command.
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cfg\The-Ship-Chapter-#.sav
Intro/outro maps do not need one of these.
The "mission" key corresponds to one more than the number of missions preceding the target mission in scripts\sp\mission_obj.txt.
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SAVE\chapter#.tga
This image should be scaled to 256x128 from 152x86.
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materials\vgui\chapters\chapter#.vmt & materials\vgui\chapters\chapter#.vtf
The texture should be 256x128 with the 152x86 image embedded at the top left.
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resource\MODDIR_english.txt (and other languages)
The chapter name should go in here with the string name as MODDIR_Chapter#_Title

