Modular Fractal Pyramid, designed by me, based on Jun Maekawa’s Fractal Pyramid

Some time ago, someone showed me Jun Maekawa’s Fractal Pyramid, and I thought, I could make that modular.  So I designed custom units–actually, several distinct custom units.  This is definitely over-designed, and not fit for sharing instructions, but it can be fun to make a one-of-a-kind model.

How many units would you guess are in this model?  Highlight to see answer: It’s 29.