Within 2 to 3 degrees of perfect alignment you'll never notice any issues significant to worry about. Perhaps if you were competing at the world class level it would be something to fix. But if you were that good you would not be buying pre-assembled models of this sort of quality. Even then I suspect that any effect would go unnoticed. The key point will be all the know it all pundits on the flight line telling you that your model is crooked.