I tip my hat to you sir. I didn't even consider 12'ers. At the very least, take a sharpie marker and sign and date a wall stud.
The sheetrock I hung in my attic train room kicked my tail, and that was back in 2010 (I was 52)! I wish now that I had hired a professional to tape and mud. You'll want to get all of your train stuff out of the room when you start finishing and sanding. It's a real mess when you do!!
