Do you actually have a copy of the rules? If not you need to get a copy. If you "look around" you can download old copies on the www, but if you are actually going to "do" this I would certainly get an updated copy.
A trunk mount battery needs an all metal firewall for a cell and a battery, has to be "so thick" steel and different spec for aluminum
There are many threads here on disconnects. It's not as simple as simply disconnecting the battery..........as disconnecting that battery with engine running will allow the alternator to keep the engine running. You need to address that.
Here's some of the general safety rules........
http://www.google.com/url?sa=t&rct=...rhWnnGiPFq4Zoq03A&sig2=eRttL5k_F2zTm-IKR248Gw
2012 rules
http://www.google.com/url?sa=t&rct=...aOnHkJcASAi0klijw&sig2=gGV-Mk5uhLMMiwRdaFq1NQ