Only nomp? Why didn't you go for mpos frontend? Just curious not a criticism of course.
to be honest, I am not familiar with nomp for mpos. I don't know how.

there is a guide in the nomp github, here:
https://github.com/zone117x/node-open-mining-portal/wiki/Setting-up-NOMP-for-MPOS-usageIf you get into trouble there's always freenode channels $mpos and #nomp pn IRC.
I set up my pool with nomp as a stratum server and mpos as frontend because it gives you more details about your pool. If you used mpos in the past it should be
very easy to do.