probably easier to just build it within the existing app
if it’s a minor rebrand or partial rebuild you could create a dev branch to build and test it before pushing live
if it is only a few pages you could create duplicates of the pages and rebuild them - then when they are ready rename the old pages and change the new page to the old pages url (keep the old page as a backup)
if it’s large parts of the data structure that needs to be rebuilt - that can be done in stages in a live app although it does take time and wu to bulk update things and can get tricky to bulk update data and structures in a live app - but it is possible
if it’s a major rebuild a fresh bubble app could be a good option… but you’d have to get all the old data to the new app at some point which could be a lot of wu
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