Craig,
Pressure Treated dimensional lumber is also less expensive than common here in Colorado. I just bought some to deck a trailer I just built, and was very surprised to learn this.
I pray this never happens, but if it does, please be safe in case of a fire. When PT burns, it outputs a poisonous gas that is way more dangerous than the smoke it makes. I think this might be the reason it's not allowed for the construction of walls for human occupied indoor spaces.
Your project looks really great.
David
