You are very limited , Antonio Soares makes a resin clubman body which he sells on ebay and they fit the fujimi mini cooper plastic kit but that is the only plastic clubbie body I am aware of . I can get Antonio's details if you like ???
A word of warning too though , fujimi released a rover clubman model a few years ago , it is the normal rover shell and not a clubman fronted mini . Rover used the clubman name on a roundie mini for the Japanese market in the 1990's ...
EDIT> ANtonio alsoes a pickup body too ....
http://www.automodelista.org/viewtopic.php?f=14&t=5778 just can't find a link to his clubbie at the moment .