In TMWWBK 1860s Maoris would be classed as Irregulars, not Tribal. Though if you took a non firearm units of Maoris then they would best be treated as tribal using Dan Mersey's guidelines allowing for more figures/units. It'd be possible to field a 'traditional' Maori unit from Tītokowaru's prophet forces as non firearm if you want.
Therefore, most Maori forces come in at 4pts a unit, each 12 figures strong by following the guidelines below fromTMWWBK. With the ability to upgrade units that'd make for a Maori force off around 48-72 figs...a nice fit. The respective Colonial forces would hover around the 5-7pt mark giving 4 units of Forest Rangers ie 50 or so figures.
...this would make for an fine small force for the 1860s Maori conflict using TMWWBK.
😉
Regular units: 6 points per unit.
Irregular units: 4 points per unit.
Tribal units: 3 points per unit.
Crewed weapons: 4 or 6 points per weapon.
I'm sure most colonial players will be able to work out the likely differences between Regular, Irregular, and Tribal, but bear in mind I suggest fielding tribesmen who are good shots (e.g., Pathans) as Irregular infantry rather than Tribal, and reserving the latter for proper spear/sword/shield types.
Forces can be adjusted by upgrading or downgrading some unit abilities as explained in the full rules; however, you cannot keep downgrading a unit to cost less than 2 points, or upgrading above 9 points.
Recommended unit sizes
My suggested unit sizes are as follows, although you can adjust them as you wish (which will impact on points values):
Regular and Irregular infantry: 12 models per unit.
Regular and Irregular cavalry: 8 models per unit.