I've all but stopped being worried about mold, green board, and vapor barriers. I"ve applied a primer/sealer w/mildew inhibitor on all the walls.

I've called every place within a couple hours of me - even posted on carpenter forums - and nobody in SoCal has Spanish Cedar Ply. Many have or can order board feet.

The good news is, I've found a couple one stop vendors who are working up package prices for me.

The door is the other pain in the ass: Too small an opening for a slider (they make 'em, but just too narrow for my taste). Exterior French doors will seal tight, but cost a load of dough and require a threshold at the bottom. I'm leaning towards an interior set of French doors with some weather stripping.