I wrote a small tutorial that explains how
to run SlapOS and ERP5 independently of Nexedi or VIFIB.
https://www.nexedi.com/slapos-Blog.Mynij.Success.Case
It was quite fun to do. Please feel free to give me some comments before I broadcast it.
I found one bug in slapproxy: it does not support running multiple erp5-cluster instances.
Instance naming unicity is not handled properly. One instance will overwrite the other if they have same name even if they do not share same hosting subscription.