RE: PT40 dihedral
Leave it be, Its silly to start modifying the daylights out of it and you have not even started flying yet.
Winds are not a problem with a properly set up two axis larger trainer. Crosswinds on takeoff or landing are where that control setup is disadvantaged. Taking off, landing into the wind or in the air you will not be at a substancial disadvantge.
Time to stop researching it to death, finnish the airplane and get started.
John