Today was a big day. I finished fairing all the beam parts - I hope I got them right. I spent an hour sanding the inside of the hulls before wiring the two sides together. I used 120 grit paper on a random orbital sander for all the sanding. While working on the first side, I couldn't tell that I was acheiving much. When I laid the second side down beside the first, I could see the change sanding had brought. Other than smoothing the inside in preparation for paint, sanding is necessary preparation for when I start to glue the hulls and bulkheads together.