The road route would be the same as already proposed, Mr Havill said. It would be between 108km and 138km long, of which almost 80km was within the Southland district, and follow an unformed paper road outside the boundaries of the Fiordland National Park.
The road would be a major tourist route, cutting 335km and four to five hours of travelling time from the journey between Haast and Milford Sound, he said.
"It will do wonders for Te Anau, Milford Sound and the West Coast."
Mr Havill dismissed predictions the road could cost as much as $1 billion to build, saying he believed the cost would be $205 million, which had been increased to $220 million to allow for contingencies.
The new company planned to raise the money for the road itself and would not require an off-shore investor.
Neither would it require Government money.
"It will be a toll road. That's how it will be paid for."
In April, Southland District councillors decided they did not have enough information to support for the highway. They were sceptical of the construction estimate and whether tolls would raise enough for construction and maintenance. They were also concerned liability for the road might fall back on the council and therefore burden ratepayers.
A new council and a new mayor have been elected since then.
Incoming mayor Gary Tong has already declared his support for the road in principle.