Hey. Nice job! 
Unfortunately you got just 17 responses. It is still interesting that most people are interested in a fullstack applictaion build with aurelia which relates to your offer 2 and 3 of an application structure.
I want to point to this repository which is an aurelia application example. With all sorts of backend implementations for it here. And if you help me - related Thread - to get it merged on the main site, everyone could easily access it.
Does this help or is even a good starting point for your AUCS project?