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WOW - cool project. I can't answer the subframe question, but I like the idea of what you are building!
Can you post on a BMW forum for someone to measure?
As far as the front end goes, usually the crossmember is set a zero degrees AT RIDE HEIGHT. Check with your local front end shop for info and insight about BMW alignment specs and test yours to see if you can get these figures. Don't forget ride heights is with the size tires of your build.
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