What they said.
Also, I think that the physical mass of the construct shouldn't matter. Making it matter makes the guy animating origami soldiers feels like a munchkin, and it makes the guy making stone gargoyles feel like a chump.
And minmaxing should not have to be vetoed. It causes trouble, especially given the thin line between unwanted minmaxing and normal play.
What if I want to create a monster that relies on high skills rather than powers? That's not unreasonable, but that system makes it overpowered.
Also, I don't like the take-out-based system thematically for things other than the summoning of hostiles.