Will a copy of the Ultra Hal web server that runs the backend for the iOS app ever be available? I'd like to try building a custom version of it as a project for school, I have access to any servers or such that I may need to run it.
Off hand, I'd say no but you would be better served if you addressed your question to Robert Medeksza, Hal's creator, via email.
This page, Members > Search for Medeksza, then PM.
Luck!