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re: weight reduction
Lighter drive train parts usually result in weaker parts. Nothing is as strong and reliable as steel. I replaced my aluminum block with a heavier cast iron one after it cracked. I replaced my aluminum drive shaft with a steel one after it twisted in two. I replaced my control arms after they bent. I replaced my torque arm after it bent. I replaced my solid OEM axle housing and went with a much heavier housing after it twisted and bent (it bent by over 2 inches). I replaced my panhard bar with a stronger, heavier one after it bent. I replaced my shock absorbers with ones with bigger shafts after they bent. So, I do not think a lighter drive train may be the best way to go, unless you like to be constantly replacing parts!
Also, I would not take out inside lights. THere is nothing more frustrating than being at the track after it gets dark and not being able to see the schedule inside your cockpit. However, the rules do not prohibit cutting away inside metal. With a sturdy roll cage, lots of weight can be taken off by cutting out your inside metal panels and just leaving the outside skins.
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