RE: steering gyro
gyros are good but it you set the nose wheel up properly and put some expo in it it should not need a gyro. I have never needed one yet. In some planes you may need one on the flying surfaces. on most of the jets that I have seen there was to much steerig I don't use alot of seering movement just enough to steer it. I use approx 10 mm and it is enough to turn the plane around on a 7 metre wide runway. I just find to much steeing causes the hassales