I would be really keen to see a pic of the bracket you made to make the shock fit, this is something I have wanted to do for a while. Have you looked into replacing the fork with something better? Sorry to hijack this thread.
As for the Lipo's I really dont think you need an alarm on your lipo's I just carry a little hobbyking monitor with me and check them every now and then, you get a feel for how far you will get out of them pretty quickly. I have two of the latest 16's both running 10s lipo setups and I also have a 12.5 running a 7s setup, i've never had a problem with running them to low.