If you are thinking that the firewall is twisted or not perpindicular, this is correct. This firewall is designed with a thrust angle. The torque from the the prop spinning causes the plane to spin the other way. The angle of the firewall has the same effect as the rudder being trimmed to recover from this. So, no worries. I put this plane together but haven't flown it yet. Just a note, the tail wheel assembly included with the kit might not be the best for the plane. From threads that I have read, most kit owners have replaced them. I have yet to fly mine so I don't know how effective it actually is.