Sorry to bother you again dude, that new link has thrown up a mini confusion!
Lafrick's vanilla ROM suggests:
Boot into recovery
Wipe data/factory reset
Wait (first boot will take some time)
And from your link:
plus your notes you suggest:
1. unlock bootloader
2. install TWRP.img
3. install superSU zip
so to flash the vanilla rom & gapps I should THEN:
4. Install aosp_crespo-jb43-v0.5.zip
5. Install gapps-jb-20130813-signed.zip
6. Do I need to install superuser if I've already installed superSU?
7. Reboot, wait, enjoy