Where should I ground to when I relocate the battery to the rear bin? And any other advise for safely relocating it- such as is just securing it in the bin good enough or should I get a box?

 

you really should use a vented box if relocating the battery. this will prevent hydrogen gas from building up (i smoke in my car) and will prevent random metal objects from shorting out teminals and creating a severe hazard to the car and yourself.

summit racing, jegs, and several other companies produce relocation kits complete with cable for under 100 beans.


*edit*

im still a little unfamiliar with the cars in depth, but im sure you can find a bolt in the general area that will accept your crimping of an donut lug. clean the contact area with sandpaper to guarantee a good ground