You're obviously on a budget, so keeping it that way will mean a bit of a ghetto car. But that's OK.
Cage - Definately! It's too much hassle to get a home built cage through CAMS these days, so I'd recommend going through a CAMS recommended shop... although it will cost ya.
Diff - CIG locker will be fine for a budget car
Lights - depends if you plan on doing night events? If not, save the $$$
Suggestions...
1) why are you trying to keep it regoed? surely you are not going to drive to events, are you? The first time you have a mechanical failure/damage, you'll realise why everyone trailers their cars. Even if you car goes peter-perfect, you'll get the shits with taking tyres/tools/parts/people in and out of the car.
I would suggest club rego or no rego... cheaper, less restrictive, and you can still drive to workshops if you have club rego.
2) minimise weight. Take out most of the interior man. Makes fitting a cage easier. Make accessing wires/parts easier. Makes the car lighter. Saves bits falling off (rally is HARSH!)
3) Once you add in the cost of Harnesses, timing/nav equipment, and all the parts you mention above... You'r looking at 10k and 6 months for, in all honesty, a pretty average spec rally car.
Compare that to, say...
http://www.bmsc.com.au/forums/rally-...r-trailer.html
http://www.bmsc.com.au/forums/rally-...nt-2-door.html
Or even a classic 1600!
http://www.bmsc.com.au/forums/rally-...rally-car.html
Just my opinions on building a car from scratch![]()
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