The trust was approaching the Government and major funding bodies and would also rely on support from businesses, philanthropists and smaller-scale community crowd funding.
Interim project director Andrew Garratt said that despite the scale of the project, the trust resolved to make it entirely volunteer run.
Handing the process over to paid consultants was not an option, with about 30 volunteers expected to be actively involved at any one time, he said.
"Not only is there no budget for consultants, it simply doesn't fit with the community-led focus we've already had."
Mr Garratt said the build would likely be planned as funding became available, with the 700-day construction period starting as soon as the final amount was raised. If all went to plan the Hundertwasser Art Centre would be open four years from today.
Post-referendum, negativity that had plagued the Hundertwasser project seemed to have dissipated.
Mr Garratt said the process from now would be akin to building a business - the only difference being that no one would be paid.
The current control group was made up of representatives from the trust, Whangarei Art Museum Trust, Wairau Maori Art Gallery Board and the Vienna-based Hundertwasser Non-Profit Foundation.
The project has had various working titles throughout its 22-year history, the PNT settling on calling it the Hundertwasser Art Centre with Wairau Maori Art Gallery.