Well concerning the whole car battery thing you could go with an absorbed glass mat battery which would eliminate the whole tip over and acid problem. Also if you went with a jet ski battery that solves alot of the weight problem, they are just basically a smaller version of a car battery. (just some random thoughts)
for the stream line darts i think they sorta put the hole as a saftey precaution because if it goes over a certian fps the hole causes it to slow itsself down
be prepared for a write up because i havent seen one for what i have done
oh well for the old mod problem because it has been fixed