.15 Carrier does indeed require a Profile model as the rules read that the AMA Profile rules are to apply EXCEPT .... <certain differences in engine size, line sizes, etc.>. There is no provision for exceptions to the profile fuselage.
But don't get too broken up about it - I really don't see any way to make a useable .15 Carrier model from a stick & tissue Guillows kit. You could build a wing to the outline of the kit and use a Profile of the side view however. I don't know what the size of the Guillows kit is, but for a .15 I generally figure something around 200 sq. in. and weight of 20-24 oz.
As noted above, you get a bonus at the Brodak contest for using a Brodak kit and I believe that one of the Clowns usually does pretty well also.