[squiggleblaz]

Apparently largest assembly sizes are normally fall somewhere around the cube root of the population. Obviously you don't want so many electorates that the house becomes unmanageable, nor so few the voters can't make an effective choice. See some political scientist's thoughts here: https://fruitsandvotes.wordpress.com/category/electoral-rule...

I have no idea if that's the ideal rule or how you might determine that.