I can't help you much on the wiring since you are in BC. I did my own with help from two buddies.
I think painless wiring has a boat setup and they have a website.
Rexone here on the boards may be able to help you out too.
Brian
I think I can help you out with your nitrous though.
http://www.***boat.com/image_center/...0/63newnos.jpg