I assure you, there are a > lot > of real-life nginx ninjas out there, managing what must be millions of instances. This is not esoteric knowledge. You simply don’t know how to do it yet.
While that’s true, NGNIX is a bit trickier in a container. I do have instructions for NGNIX here: http://forum.mikrotik.com/t/mginx-container-reverse-proxy-for-cors-x-509-support-using-nginx/162709/3 – was designed for slightly more complex reverse proxy that dealt with CORS+REST-API, but steps are same.