Ok, then I did understand it right.. 
I think you have this as a real life usecase? If that is the case, you could easily make a benchmark for each service. And I think most of the services can be replaced with NethServer, but in this usecase, you do have Samba4 available and that is still lacking on NethServer. And that will be a huge disadvantage and probably a showstopper in this particular case.
The good news is that NS7 will get Samba4 and multi site. So I guess in your situation you will have to wait to propose NethServer as a full replacement for all the servers until these features are available.
In the meantime you can start with the benchmarks!
