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I would like to have my own module repository(/ies) which would be mirrored from original with few custom modules.

ModuleManager allows to change the repository url so it should be possible.

So I was wondering, has anybody build own module repository or is it even possible? And if so, how can it be done?

The ModuleRepository module is a forge module and can be downloaded and installed.

However, the data stream that the ModuleRepository module uses to fetch data from the forge is proprietary and is not public. Therefore you would need to find other ways to populate your repository.