How extensive a project is a shared user db mod for 4?

[socceronly]

I posted a paid job in the paid forum, but i am curious for some input on how extensive a mod like this would be to make?

I would be interested in paying for the development, but also make it freely available on .org for others to use.

Any input would be greatly appreciated.

Thanks,
JM

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note: There is one for the 3 series. I couldn't find one that referenced 4, if there is one... my apologies for the post.

[Alfa1]

wetalknetwork uses a version that is only 5 lines of code. No idea how that is done though.