Man, I cant imagine hacking up a perfectly good frame. People must think we are crazy here on ES!
I personally wouldn't have a problem unscrewing 8 screws to get at a battery once in a while. Every ride, now that is a different story.
1. It would be very trick to have a custom tool kit attached somewhere in the frame. It would be even more trick to have a small electric drill/driver that you could plug into your bike and use. Perhaps we will leave that to one of the motorcycle guys, huh?
2. Have you considered lights front and back? Those new LED lights are incredible and draw very little power.
And dammit, put those front skewers on right !!!