Ummm why go through the trouble when you can pick up a used M3 driveshaft for what, $100-150? Come to Ontario, there's a few parts dealers.
1998 BMW 328is - summer
1993 BMW 525i - daily
1994 BMW 325i - sold
1992 BMW 325i - gone
1988 Mercedes Benz 190E 2.3-8V - sold