At the risk of sounding unsupportive of a fellow builder. Don't try to do too much to the model. Many a model has met its untimely end at the hands of a builder who tried to chop-channel-section-narrow-pancake having never tried any of it before. My advise - stretch the frame, complete the model. On the next one, channel the body over the frame. One the next one, chop the top, etc, etc. It's a baby steps approach to learning advanced techniques.
This is a point I've brought up again and again for many builders. Please see the link below in my sig line, Walk Then Run.