Does anyone know how I can customize the Checklist in Tower?
Look here if it usefull for you https://github.com/DroidPlanner/Tower/wiki/Build-Setup
Here you can found Freddia, (the developer) to ask for help. http://discuss.ardupilot.org/c/ground-control-software/tower
It can be nice to have a step by step here if you find how to do it, nice question :)