I wish I saw this thread sooner...
When I added SAT radio to my old e92, they converted the trunk using the same housing...
FWIW- I was still able to fit 2 sets of clubs in the back... it's not too obtrusive.
2013 E92 M3 Individual
Sold: 2011 E92 M3 SSII | Sold: 2008 E92 M3 SSII | Into a Wall: 2008 E92 M3 SSII | Sold: 2007 E92 335i JB