uhm, so, this is just my uneducated ass talking, but i’m pretty sure that there’s no particles that make up ordinary matter below the planck length

and i’m saying this because as you split stuff up, you kinda expect the mass of the constituent elements be smaller than the mass of the total. so if you have smaller mass, you have larger uncertainty. and i think when we talk about the “diameter” of subatomic particles, what we really mean, is the uncertainty of its wave function. and that ironically gets larger when you look at smaller particles.