Stock LG?
yes, copy/paste the mounts from cm7 updater-script.
For using dsixda kitchen ,when you select your "original update" and prompted about to convert the updater, select the second option "keep updater-script", then you are ready to go.
If you need to add something to your updater-script,make it manually.
Usually,if you use a CM imported updater-script you neednt to add any dsixda feature to updater-script,so you are fine.
Conversion fails for our device.
if you need to root a non rooted stock rom you can use dsixda with cm updater-script,make operations with dsixda and replace the updater script with the one from cm again when finished.