Good to see people being versatile with their Z4. I don't think I could bring myself to do it. I had to move a big (empty no less) server box between buildings on campus last week and I was paranoid about scuffing the alcantara. So for me 2x4's would be right out.
I guess if there was really something I needed to do & the CRV was not available I could, teeth gnashing all the way...