There is an excellent article in the Oct. '02 issue of
5.0 Mustang & Super Fords on doing a trunk mounted battery, cables, and remote disconnect switch
A company called
M.A.D. Enterprises sells a complete kit for the relocating the battery, along with the starter solenoid, to the trunk/hatch area. Really good b/w pics in the article... the on/off switch is a PUSH on/off type and mounts next to the license plate.
This kinda stuff always becomes available after I have to do all the hard stuff myself
... otherwise I'd have this particular kit. Looks like a really nice kit... I especially like the remote starter solenoid, but you have to buy an extra part called The Connection which goes where the starter solenoid used to be, so you can hook-up the original power feed wires and fusible links, and any other accesory you might've hooked up there...
I can post some pics of my setup later...
Oh, btw, Moroso makes two types of kill switches, one is a HD version and is recommended for extended use (street driving)...