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			Not clear on the purpose here.  Anything can be done with enough time, inspiration and $$$.   I assume this is going to be a stripped out race car that barely resembles a Boxster.  Why use a Boxster chassis at all?  I would think a purpose built tube frame designed around your powerplant would be simpler and a lot better in the long run. 
 
** Porsche DME will be very unfriendly to the BMW motor. 
** Boxster tub will be heavy and useless in a purpose built 700hp race car.   
** A stretched frame Boxster will have few of the handling qualities of the original car.  
** Tip transaxle will not survive your powerplant. 
 
It might be cheaper to just buy a 997 cup car and go racing.
		 
		
		
		
		
		
		
			
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				2009 Cayman 2.9L PDK (with a few tweaks) 
PCA-GPX Chief Driving Instructor-Ret.
			 
		
		
		
		
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