One of Morrinsville's colourful cows in the Herd of Cows? street art project.

Morrinsville's 6.5m tall "mega cow" is currently under construction and could be finished this winter.

The large cow is part of the town's Herd of Cows? street art project, which has 42 colourful life-sized cows around Morrinsville township.

The Maber family, who own the Power Farming Group, are sponsoring the mega cow, which will stand about two storeys high.

The idea for the massive bovine came from former Morrinsville mayor Laurie Maber and his wife Yvonne, who are now both in their 90s.

The cow will be placed on an 800mm concrete plinth at Power Farming on the main road into Morrinsville.

Power Farming Group chief financial officer Kevin Stowers said the giant bovine was currently being built by Hamilton boat builders Matcraft Industries, which made the 42 cows.

A lot of the work had also been sub-contracted to Morrinsville businesses, he said.

"We are making sure that where possible, the Morrinsville businesses can get the benefit."

Stowers said the finer details of the design of the massive cow were yet to be finalised.

However, it will be a similar shape to the existing fibreglass cows in the street art project, and will be painted the Friesian breed colours of black and white.

Resource consent had been granted for the cow by Matamata-Piako District Council.

The cow will be 11m long and 5m wide, and will have directional spotlights mounted underneath to illuminate it at night.