Ditto on what Bruce said. Actually with the ten gram motor set up you should be able to achieve an all up weight of closer to five or six ounces (or even less!) than the fomidable ten ounces. This will give you a more enjoyable flying experience.
Another Guillow's model that has been done with great success in flyability is the Fairchild 24. See it here:
http://www.pennvalleyhobbycenter.com...1fairchild.htm
There is a long thread (on another forum) with several modelers showing how they did theirs plus finished and flying pics as well as flight videos. I was well impressed.
Robert