I've decided what I want to build. Actually I decided a week ago, but I've put off saying anything, not to be secretive, but to make sure I could actually do it, and to gather information.
I thought again about all the odd models I'd like to build - the 40, the 80, and the 200 - and then it hit me: This GB was created to celebrate the first flight of the first Boeing, so why not try to build the Model 1?
Before I said anything I wanted to see what plans and photos I could find. I came up with a good three-view drawing and several old photographs of the original, plus some pictures of a full-scale flying replica someone built some years ago. This now hangs in the Boeing Museum, so I emailed them asking if they had pictures or descriptions of the interior. It's been five days and I haven't heard anything back yet, so I decided it would be rude to delay it any longer.
I put the plans into a desktop publishing program and resized them to 1/72, based on the dimensions given by Peter Bowers in Boeing Aircraft: 1916 to the Present. I have an architect's ruler I've been using for forty years that has one facet scaled to 1/720, which of course can be used for 1/72 if you don't mind each scale foot having 10 divisions instead of 12 inches. Last night I ordered online a true 1/72 ruler, marked in feet as well as metric divisions. I've also ordered some model railroad scale louvres, hoping they'll be the right size for the rows of louvres on either side of the cowling. If not, I'm going to have to learn how to make them myself.
Technically it's not started yet, but I have begun gathering materials and going over it in my head. Obviously it's going to be a scratchbuild.