Is this the block/pattern you are looking for?
https://www.pinterest.com/pin/160722280435704646/
If so, I would cut the squares at 4-1/2 inches, and make templates for the pointy units.
It looks like the points are about 2/3 of the height of the unit.
Because 4 inches is awkward to divide by 3, I drew the height of the points at 2-3/4 inches. That could be adjusted to make the points taller or shorter.
I would mark the pieces for where to line up the seams until I became comfortable with where/how to line them up properly.
This is how I make templates:
Making templates for a triangle in a square unit