Found this on fleabay, potentially worth a few quid 
http://www.ebay.co.uk/itm/RENAULT-5...omobiles_UK&hash=item1c222b7754#ht_819wt_1189
http://www.ebay.co.uk/itm/RENAULT-5...omobiles_UK&hash=item1c222b7754#ht_819wt_1189
£6.5K for that...I know the Turbo 2's are worth some money when immaculate...but that would probably cost double its immaculate 'value' to put right.
Spend 10-15k minting it and a year or two... then sell for 60-70+ as an immaculate example.