Would love to see some form of option to be able to lock the upgraded chest's to either a single user or a group/team of users.
Loving your work thus far, thanks for making this mod poissible for fabric!

This is not a planned feature nor one I intend to develop.
The modpack you are playing should usually have a mod that allows you to claim a chunk and share it with a group, which partially integrates the feature you are looking for.

I personally do not have time to develop this, but if anyone want to contribute and submit a pull request, I will merge it and release it!

Would love to see some form of option to be able to lock the upgraded chest's to either a single user or a group/team of users. Loving your work thus far, thanks for making this mod poissible for fabric!

Using the mod Things adds a craftable key that can be used to lock chests. It works for single users, there might be a way to make copies of the key, but I don't know for sure.

What I do know, is that it does in fact work on these chests.