PkmnLabs

the old inventory still exists, and also that link doesnt work (it brings up an access denied page, im guessing you just copied the url and not made a share link? for future reference you generally need to get a specific share link for other people to see things in google drive)
i have added things according to the old inventory, however i am aware that in the past the sheet bug had definitely affected you since you had been around for a while, so if you could get a link to the sheet you made and either reply back or if you changed your mind prefer to keep it more private, note it to the group (please do not note me personally)

there was one reference linked in the old inventory that was used to calculate out levels and also to fill in one missing pokemon and some traits had been fixed to fit the designs so nothing will need changing from what i had

or would it just be easier to start over?

yes. i will do my best to fix anything that will break once it rolls out, though i wont be able to say how quickly