If that's how they set up the model it implies that it's not a trainer.  Or they just expect the builder and pilot to shim the wing as Rick mentioned. 

If you're building a model to train other new flyers then I'd likely build in another degree of positive in the wing.  Putting it in the wing does two things.  It increases the decalage and it sneaks in a degree of downthrust since you're altering the wing to thrust line angle at the same time as the wing to stabilizer angle.