Eric at RSM kits 2 different P-40 Profile Airplanes.
P-40 Tiger for Glow Engines, Wing span 46", Length 36", Area 490 sq. in.
P-40 for Electric Power, Wing Span 52", Length 39", Area 624 sq. in.
The Best Flying, Easiest to Trim, Beginner Plane (No FLaps), is the RSM "Mark One"
It has taken me from Beginner into Intermediate flying with a Fox .35.
I have outscored flapped models and electric models.
The Mark One has a thick airfoil, is difficult to stall, very forgiving, corners very smooth.
The kit is very easy to build, no more difficult than the Shark 402 kit you have.
It also builds very light.
I think this would fly with an FP40 glow engine, however I would check with Eric Rule on that.
Hope some of this helps.
Larry