Hi,
have a look on
http://lamboreplica.co.uk/ and do a search or post your question on there.
If no joy have a chat with Sam Harpa at Regal Classics, he is building a Muira Replica on a Porsche Boxster chassis, he may be able to help.
http://www.regalclassics.co.uk/
Also, you could speak to Dave or Clive at DC Supercars who build replica Countach / Diable / Merci reps - veryt knowledgable
http://www.dcsupercars.com/
Cheers
Steve
PS - more pics please :0