It just gets easier and easier.
Edit: How easy, you ask? Well, I'll tell you. Precocious Apprentice requires arcane caster level 1. I do believe there is a feat (Magical Training?) that grants you the ability to cast a couple of arcane cantrips, that means that anyone with two feats (humans, anything with a flaw*) and an 8 point buy can get a Simulacrum going and can become Pun-pun. Wheee!
*Except Dragonwrought Kobolds. I like to think of the Kobold as the anti-Human. You get one less feat, but you have many ability score adjustments and a bunch of random racial traits. Anyway, yeah, they need two feats for this, unless they aren't Dragonwrought (blasphemy).