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Chromoly is the lightest, but the ENTIRE cage has to be heat treated after ALL of the welding is done in order to get the strength back. Because nearly no one does this chromoly is illeagle for a few sanctioning bodies as of Jan 2007.
It looks like you gleaned the important points from the posts above. Don't make an X when a single cross bar will triangulate. Chmercer is dead on about the harness bar, it needs to be about level with the top of your shoulders.
Most importantly read and re-read the rule books of the sanctioning body that you want to race under. Many sanctioning bodies will allow you to petition for acceptance of a cage that has been approved for another.
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