"It's a quickfire thing over a power and speed course," explains Hansen, adding the fence structure will have a spread of between 1.6m and 2.2m.
"There's no technical aspect to it like they have with grand prix events when horses must make three to four strides before jumping between fences."
After the six fences, the riders go through a set of flags in anticipation of negotiating the speed section.
That will comprise seven to eight 1.35m fences which rider-and-mount combinations will race against the clock.
If both (Kiwi and Aussie riders) register clear rounds then it'll go down to a countback on times.
"It's time to revolutionise the sport so that you don't have to wait for everyone to jump off to know the winners. This will be one against one and instantaneously New Zealand will be one up so the crowd will follow that very easily."
As it turns out, a need-for-speed element will prevail with the course, too.
With a wedding at the winery on Saturday night, course designer Gerrit Becker, of Tauranga, won't be able to start building the course until 7am on Sunday.
Says Kevin's son and Hoy Show events manager Andrew: "After all the seeds finish, the last round will be the bonus round."
Each team will nominate a combination for the 1.8m to 2m fence in an opportunity to boost their scores with triple points for the $8000 prizemoney.
Initially, the Hansens had envisaged eight-rider teams but they couldn't find a flight for an Aussie rider from Melbourne until this Sunday.
"Seven's a good number. It'll be like soccer and rugby and it'll be done and over in 90 minutes with loud music and entertainment," says Andrew.
Full throttle is a preamble to the five-day Hoy Show which starts on Tuesday next week at the Hawke's Bay Showgrounds in Hastings.
It is the brainchild of the Hansens with the son mooting the concept about five months ago and the father triggering off an argument with: "Nooo, you can't do that."
But the impasse dissipated when the concept found traction among enthusiasts around the country and the senior Hansen devised the rules.
Andrew: "We were looking at how we can make it more appealing to the public."
Kevin: "It's caught on and all the South Islanders are talking about coming to watch full throttle.
"I've got to think twice about what it's all about."
In fact, the idea is born out of frustration after Equestrian New Zealand stripped the traditional test between the two countries from the show and gifted it to Tauranga.
Andrew: "So we wanted to make it the most exciting test match in the country."
Okay, has the national body given its blessings?
"Oh, hell yes, they will be. We just haven't told them yet," says Kevin with a laugh.
No doubt the notion spooked some riders but not New Zealand captain Maurice Beatson and fellow Dannevirke rider/teammate Logan Massie.
"Morrie thinks it's fantastic. I talk to young Logan and he loves it and just can't believe we're doing it."
A Kiwi rider thought long and hard about risking injury two days before the marquee events of the Hoy Show but she has opted to stay in the team.
The other Kiwi team members are Katie McVean, of Cambridge, who is expecting her first child, Europe-based Sam McIntosh and Miranda Harrington, Vicky Wilson and, wait for it, Philippe Le Jeune, of Belgium, who will be wearing an All Black rugby jersey and will become the first World No1 showjumper to compete in New Zealand and Australia.
Mmm ... do the Aussies know about the Belgian?
Kevin: "Not yet. They'll react but then who cares."
Billy Raymont will captain the Aussies who include Merrick Ubank, Sheridan Emanuel, Jono Smith, Emma Smith, Sarah Beale, and Suzannah Willis.
Andrew has a different spin on the Belgian, who will be riding Down Under for the first time.
"You know how they bowled underarm to us in cricket and are now keeping us out of the supermarkets [with NZ produce], well ..."
A grinning Andrew reckons it'll evolve into a global crowd-puller and they will "sell the franchise" although they haven't registered it as a trademark yet.
The afternoon's entertainment will also offer a "curtain-raiser" of ballet dancers and dressage events, starting at 11am, but the Hansens aren't fussed if the public give that a miss.
Says Andrew: "You couldn't ask for a better venue than Church Road where the atmosphere will be electric and the scenery picturesque - one of the best in the country."
