As already indicated by some of the guys. Figuring pilot size from measured scale is hopeless and usually ends up almost humorus looking. This is especially so for many Arfs. You are far better off going strictly by Eye and what looks good to you, That will be the correct size.

A pet peeve with me is many of the supplied pilots or molded in pilots from CMP as well as some other china products are hugh and as far removed from scale as possible. They look more like cartoon characters.

Canopys used by many of the CMP airplanes tend to be far too big. This is caused by fat fuselages. Fat fuses are used to make it easier to install servos and what not. If you look at every Spitfire arf avaliable today for example you will see not the slender true scale fuselage but instead a fat blunt object thats easy to put servos into.