"Last year we struggled with a 15-a-side team, and barely scrapped through with subs," she said.
"Now, mostly the team is all new – it's a bit of a growth year, this year.
"We're going to be putting in two 10-a-side teams."
With 28-30 girls available, Tamati has gone with an even split of the leading players across both WHS sides that will play on Thursdays.
"I didn't want to do a 'B' team because they're so inexperienced."
As well as all-rounders who want to give every code a go while at school, Tamati also has players who want to see a clear pathway to higher levels – following their alumni Holly-Rae Mete, who this week was named in the Manawatū Cyclones extended squad.
Tamati is delighted with the WRFU support in developing the game locally, as well as from parents and grandparents who will transport players to Palmerston North on Wednesdays.
"We end up leaving at 2pm, get there just after 3pm, and do the warm-ups – it's a big commitment.
"I couldn't even imagine us playing XVs, let alone in the Manawatū competition, just a few years ago."
Cullinane won their grading match last week with WHS by 51-5, and coach Ivan Syme has some big plans for his 29 players in 2021.
Only four Year 13 girls have departed from last year's squad of 26, of which 17 were Under 15 level.
"Hence the reason we've got a good turnover rate. We've got youth on our side," said Syme.
Last year, as well as MRU 1st XV games, Syme took Cullinane teams to the Hurricanes U15 tournament, the Condor Sevens, and a sports exchange with Auckland sister school Marist College.
They will enter one squad in the 10-a-side competition, but do rolling subs, and competition for spots in the Wednesday and Thursday lineups is expected to be keen.
"The girls know there's criteria to meet to make the match-day 22," said Syme.
These include good attendance to both training and class, and commitment on Wednesdays which will see them leave Whanganui at 1.45pm and not return until after 7pm.
While Syme expects players to still retain interest in the sports they grew up with like netball and basketball, his goal is to up-skill the truly committed so they could be playing Farah Palmer Cup in 3-4 years.
"The whole idea behind the programme is to show all girls' at the college, the pathways that rugby has to offer for females."
The nine-team MRU Premier Secondary School grade will be played at Ongley Park, with 30-minute halves.
The top two teams will qualify for a straight final, while there will also be a playoff for third/fourth.
Syme said Cullinane's goal is to reach the top four, and push close to making the championship game.