So, I'm not an expert on Blesta or NGINX, but I have learned the easy way to make the two work and wanted to share. Credit to cloudrck for starting the project on github (I have used a lot of his work in the config.)
1.) Fire up a fresh install of Ubuntu 14.04 64-Bit (DigitalOcean works great for testing)
2.) Install EasyEngine (easy way to setup a LEMP server)
curl -sL rt.cx/ee | sudo bash
ee system install
3.) Create your site with EasyEngine
ee site create youdomainname.com --my