Questão jurídica principal
Whether the defendants were in culpable delay and liable for delay damages
Decisão extraída
The defendants were in default from 1 April 1997 at the latest, and their delay was culpable.
Fundamentação extraída
The lump-sum price, payment schedule, and completion period were unrealistic; the plaintiffs' late payment only postponed default, and the defendants did not prove absence of fault.