Hi DOS76, thank you for your answers.
1. I don't know how I would access my friends server, my question was more like if it is possible to use BigBox as a media server but the server is not local, I must access remotly. How? I dont know yet
2. It doesn't have to be images with roms. It can be something like a portable version of BigBox, with all dependencies needed, all emulators configured with the proper bios installed (for those who need it), controllers configured, cool themes applied, etc. Where one just has to add its roms (and load them into LaunchBox).