Tell us about yourself!
Did you think about adding an on/off switch in your power feed so that you don't have to worry about draining the battery or climbing in/out of the car while getting ready/after your shower? I have some friends that built a similar system, but they put a timer on it so that it doesn't drain the deep cycle battery if someone forgets to turn it off when they're done.
I copied it from sheet music I found for free online. Just match the notes to the different notes and durations.
Homemade card scrapers