Interested in how the deck goes. Yes that's the main bugaboo.
You are on about the ratlines.
As for the sails, the best advice seems to be to paint them light tan and then weather them. I'll remind you in a year, but when it comes time to attach them, please don't use a running stitch. it just looks bad. The proper way is to individually tie a series of short pieces of rope (called robands) through a hole in the sail and around the yard.
Keep posting as you go.