what to cut body with
 

hey, what do i cut the body with if i want to make a bigger hole for a second battery to stick out?

a razor or a dremel

I'm also interested in what people have found for this.

I've heard a hot xacto knife works pretty well. Can a dremel do precision cutting on the body for other, smaller, areas?

dremels move to fast i think to control for tight areas, Yes, hot exactos work well, keep some flame handy :D

yes a Dremel [or any small drill] and an exacto...
theres a trick i learned...
if you have a portable table lamp,
let your car sit near the light for ...i dunno a minute or two til it gets warm BUT NOT TOO LONG....and now the body is easier to cut....
like butta :D

Tried the lamp idea yesterday. I did notice the difference. Great tip!

if making straight cuts you may consider a model saw or jewelers saw . a small very fine tooth saw. it leaves smoother edges.