@YukonTrooper: Not really, no. The Fonts hack does the job on the custom fonts front, and the rest is trivial enough that using the Calibre plugin is way more user-friendly than anything I could come up with.
@blaser: The setup script is quite correct. It's just not made to be run in any other environment than the update process, where the system is in a limited runlevel, with nothing potentially annoying running in the background, and, more importantly, where the rootfs is rw (that's not to say it can't be installed manually, just, not with the same install script. [you'd at the very least need a rw rootfs, but you're on your own]).
So, yeah, we do need more info/logs about what happened when you tried run it like everyone, via the ota updater.
@seanlv:
1. Yep, you got it right, linkjail/info.txt & usbnet/info.txt
.
2. You need to uninstall the jailbreak first to be able to update it.