This is another attempt at producing an xdg-app bundle for Terminix.
To try this out, download terminix.x86_64.xdgapp, and run
xdg-app install --user --bundle terminix.x86_64.xdgapp
xdg-app run com.gexperts.Terminix
This assumes that you have the gnome 3.20 runtime installed. If that is not the case, follow the instructions on the GNOME wiki.
Keep in mind that you'll be running code that has been built on my laptop, in a non-sandboxed fashion.