The stolen cladding could be linked to the theft of a trailer from the Rawene Hospital grounds around the same time. A truck or large trailer would have been needed to take so much cladding, he said.
Club president Rene de Vries said the trust, which was trying to revive sailing on the Hokianga Harbour and provide youth with a healthy pastime, originally needed somewhere to store and repair its boats. The cash-strapped club was given a huge boost when America's Cup syndicate Alinghi donated a shed intended for its New Zealand campaign but never used.
Later when the Far North District Council got on board and the project grew to include a community gym, Alinghi's shed was no longer big enough. Kerikeri firm Totalspan offered a good deal on trading the shed for a larger model, which is now half built on Rawene Domain.
Mr de Vries said the project had suffered some delays but the trust had been on track to open the building next month, in time for the summer sailing season.
"So this is pretty devastating ... I don't think it's someone from Rawene, but who knows?"
The theft of the trailer - made of galvanised steel with LED lights and steel ramps, registration K145T - has also left a lawnmowing contractor struggling to continue his business.
In total 90 sheets of zinc-coloured (grey) seven-rib zincalume roofing were taken - 36 sheets of 3.2m, 44 sheets of 4m and 16 sheets of various lengths.
Anyone with information about the theft, or who knows where the cladding ended up, is urged to call Kaikohe police on (09) 405 2960, Rawene police on (09) 405 7760 or Crimestoppers, anonymously, on 0800 555 111.