[wisp]

I've made a mistake in thinking that inertial mass comes from the gaps in the ether. It doesn't. It comes from the ether particles that make up matter's structure.

The answer to the question should be:

The tiny particles that make up the ether have mass and there are a finite number of them associated with each type of fundamental particle, which forms spherical fractal patterns around holes in the ether, and each pattern has a unique mass value – this is its inertial mass.