It would be wonderful if someone would indeed post a blow-by-blow How To Compile BrewPi Hex Code In Atmel Studio 7.
I've given it a couple of tries and utterly failed both times...
Cheers!
Honestly, I tried, and found it wasn't worth it back when I was working on the ESP8266 version of the firmware. As I get Arduino support in Fermentrack up and running if there's a need to recompile anything I may take a stab at getting everything ported over to Platformio.
Otherwise, I would strongly, STRONGLY recommend anyone that is interested in recompiling the hex code look into platformio as an alternative to Atmel Studio/Visual Micro.