Going to convert my LT-40 to a taildragger, and am not sure how to position the wheel on the bottom. How far back should it go from the end of the fuse?

Any suggestions on what to use to connect the control horn to the servo? The directions suggest monofiliment which I think will stretch too much.. I will most likely solder whatever I use to the springs that were included with the kit, but need some suggestions on what material to use...

Any help is appreicated.