Not only have I been replying I have been working on an update that allows the preservation of the symlinked shared mods directory and the single user use case. As I said in my previous email to you I am still working on this but haven't got much time at the moment.
Also the package compiles fine and it also builds and updates itself from the main atlauncher server on build, it is almost like an equivalent of a git package but instead gets the latest version of the atlauncher binary from the site.
Please post the logs showing it not building on your machine and we can get it working for you but it works for me on a clean install of Arch as I have tested it!
The only thing that is not up to date that is even remotely troublesome is the icon file which is no big deal.