In Vmware, I get the following issues:
*help-text at pressing F1 is too long (25 lines should be maximum).

if you have programming experience, you might want to create a syslinux COMBOOT module which displays the document you want to display one screen at a time.

*MAME does not have correct attributes. Since it's on a read-only medium, your users are out of luck.
"/mnt/cdrom/bin/xmame is not a valid executable"

Impressive bootable medium, by the way. GameOS

I'll have a look at the kernel structure, though I'm hardly familiar with GNU/Linux at all..