Manual deploy to Ubuntu with custom RC bundle

I managed to deploy RC to a Ubuntu fresh 18.04LTS server following the RC docs > Installation > Manual > Ubuntu. That process downloads the latest official RC release bundle, I plan tu use RC with some customisations so I’d like to use my own repo.

Please, how can I use my customised source (or bundle) instead of the official one, when deploying using this method? I will need to rebuild from my customised repo from time to time. Thanks.