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Yeah, originally I was planning to use an E30 rear axle (very similar to the E28), but the more I thought about it the more I leaned towards the E39. For me, it's not a daily driver or anything so I wasn't planning on using the back seat, so I didn't have any problems cutting up the rear floor. The semi-trailing arm axle gives you a reduction in unsprung weight and the ability to tune some of the wheel angles, but you still don't get the good kinematics that a double wishbone axle allows. So now I have an E30 axle just sitting around. For the rear shocks I will be doing a pushrod setup with rockers so that I won't use up too much room for the wide wheels. That could easily be done under the rear floor, but it's cooler if the shocks are sitting in the back seat