

Sounds legit to me. Padman could be seen as a separate Unix system or the programs to live in, and therefore would have its own set of user and group IDs. As long as the created files have permissions that are different from The host permissions and they will still be inaccessible without some permission manipulation.
If you are trying to access several different services through the internet to your home network, you are better off setting up a home VPN then trying to manage multiple public facing services. The more you publish directly to the public, the more difficult it is to keep up with everything; It is likely needlessly expanding your threat exposure. Plus you never know when a new exploit gets published against any of the services you have available.