Ok, finally have some progress to show. After construction of the prototype I have found a few small problems that I need to iron out. The fuselage piece behind the nose needs to be a little smaller where it connects to the nose, the swing gears need an extra tooth to allow a full range of movement, the wings need a little extension at the root, and I'm seriously considering removing the tabs from the fuselage pieces, and replacing them with small cylinders that would connect each part, allowing for a more seamless fuselage. Normally I don't worry about that kind of issue, the fit with tabs is usually good enough, but because there will probably be very little detail in the "paint" job, the seams will be much more apparent on this model than on past models. It also means I'll probably have to play with the fit a little.
Currently, this model is only two sheets, the shortest swing-wing model I've designed. It is also, oddly enough, larger than a lot of the models I've designed. This probably has to do with the relative simplicity of the actual aircraft, and large use of cylinders and planes. The good news is that it makes for a simple model to build, and like I said, less to print.
I'm also considering a larger scale model of it, though I doubt it would be any more complex, and I'm not so confident that my models would hold up to much scrutiny at a larger scale. I probably won't make one unless someone specifically asks for it.
The 2707-300 should be slightly easier to design than this one, because I can use some parts of this model, and because it doesn't have swing-wings.