Sounds like you have your work cut out for you there
Im sure someone out here has a set of plans laying around.
As far as the CG goes, I do not recall the GP F-14 having an CG issues. Last one I test flew for someone had a ST75 up front, and seemed to balance just by locating the equipement in the right place.
If you are going for a more scale look.... probably ok...... just be prepaired to move some equipment aft to compensate for the longer nose.