Jake, go with poured in place concrete next time. and metal studs on the interior. Best of all worlds (studs are lighter, and termite proof) because you can move all the interior walls (which are fire resistant), and you've got a bulletproof building envelope.

You can even get metal roof trusses. So you'd only have plywood roof deck for a hip/gable roof. Maybe they have options for that too...

Or just use more DDT