Have any of you seen the contract? Just because work has stalled does not automatically trigger a right to sue. I'm assuming it's a standard JVC contract and there will be various clauses in there in respect of penalties for late completion etc.

Construction disputes tend to be very very costly and all parties, if they share a brain cell between them, will want to avoid a formal dispute if at all possible. Construction contracts usually have an arbitration clause in them in the event of the parties to the contract falling out and believe me, Arbitration ain't cheap!