I was lucky also that my battery didn't get damaged. Love the Pocoyo avatar.
For the battery doors, I thought of a strap of something tough, like Kydex, bent into an L shape. One end bolted to the side of the doors and the other end would have a 1/4 inch hole to snap on a short body post screwed on top of the batt compartment. Once the strap is snapped on the body post, a body clip would go through the body post to keep the strap in place.
I looked at EC5s a few times, seems like good stuff but expensive. I wouldn't mind if I had four or 6 lipos but when you run with twenty lipos and you have to make a parallel connector and the charger plugs to charge two lipos at a time, it ads up quickly. I know some will say that this hobby is expensive and that I should not try to cut costs but I can't be spending money like there's no tomorrow. Can't afford to do that but I still want to be a part of this hobby so cutting costs is part of the game for me. I'm going to try
these, I will use the females on the lipos with color coded heat shrink, the kind I get at the electronics supply store, very thick and tough with hot glue inside. It should be good at preventing the two leads from making contact. I have seen others use these bullets with great results.