this could be a nice cheap project for someone, it looks like it only needs a couple of pannels and it is well specced with low miles???
http://cgi.ebay.co.uk/2004-BMW-Z4-SE-SAT-NAV-DAMAGED-REPAIRABLE-SALVAGE_W0QQitemZ170340575310QQcmdZViewItemQQptZAutomobiles_UK?hash=item27a916e84e&_trksid=p3286.c0.m14&_trkparms=66%3A4%7C65%3A10%7C39%3A1%7C240%3A1318%7C301%3A0%7C293%3A2%7C294%3A200
http://cgi.ebay.co.uk/2004-BMW-Z4-SE-SAT-NAV-DAMAGED-REPAIRABLE-SALVAGE_W0QQitemZ170340575310QQcmdZViewItemQQptZAutomobiles_UK?hash=item27a916e84e&_trksid=p3286.c0.m14&_trkparms=66%3A4%7C65%3A10%7C39%3A1%7C240%3A1318%7C301%3A0%7C293%3A2%7C294%3A200