Hey Trainman 2001,
I just came across your thread on building your new layout. I like that you're documenting your progress for others to watch. After reading the entire thread I only have one question. Why didn't you build a wall infront of the basement wall so you could insulate & sheetrock for warmth? I like your idea about using Tyvek in the ceiling, I'll make sure to use your idea on my new train room. Keep up the great work.
Chuck