"My easel art will finally come through in this mural," he said.
The paintings would include messages in te reo encouraging youth and reflecting positive features of the area.
The final wall will portray Marsden Cross, which marks the site of the first known Christian service in New Zealand at nearby Oihi/Hohi on Christmas Day, 1814.
The idea was to have the shed, a long-standing eyesore, transformed into a work of art well before visitors start arriving for the service's 200th anniversary.
Mr Wilkie said he was celebrating an anniversary of his own because it was 30 years since he painted his first large-scale mural on the now demolished A&P Show buildings at Whangarei's Town Basin. He has also painted the Jack Morgan Museum at Hukerenui and Marino Court in Kaikohe.
Tapuaetahi resident Mike Stephens is driving the project and raising the money needed. Waka ama club members Rose Heihei and Tuppy Kaiawe have been directing the young workers.
Mr Wilkie said Te Tii kaumatua Arana Munro had given the mural his blessing.