How about if they are just being used for their collision hull (cylindrical pins)? or their elastic, friction-free surface (the level itself)? For the balls that aren't in the playing field, perhaps I could use "Fake Fizziks"?

Anyway, it's all for naught if the collision system can't handle small steel balls wizzing around hitting pins and other small objects (ramps, spinners, rails). At any scale the pins have to be small in comparison to the balls. No pinball simulation is possible without that.

Though I haven't tried scaling the larger sized blocks down yet. Notably the invisable "glass" front.

I have some time tomorrow to test this again.