Looking at pic 3 shows that you will have much better (tighter) turning in one direction than the other. The closer you can have the tiller arm to perpendicular to the fuselage centerline the better as it will even out the throws. What you have is similar to setting up differential on ailerons.

Pic 7 shows the steering rod connected to the outer servo arm hole. This may cause excessive steering throw. You may be able to handle it but it may also be too sensitive. This can be changed later if desired. Large rudder throw should be OK, large steering throw may not be