I don't think you can do much better than follow Bruce. I glued my wings to the main spar and in place and haven't regretted it. Make sure it fits in your car with the wings in place first of course! I used the TGS 6x4 prop from the outset.
The other things I did slightly differently to Bruce was to cover the bottom of the plane with white covering film, which has worked well, and to attach the hatch with this
HK canopy lock rather than a rubber band. I also covered the bottom of the wings with clear tape and put red flashes of covering film on the outside tips of the lower wings to improve visibility.