Yes, the Sullivan push rods can be cut to length to suit the plane you are building. I would suggest going the Sullivan route until you gain further experience and find something that works best for you. After many years i still use them quite often. You really can't go wrong with the Sullivan push rods. Add some support to keep them from flexing and you are good to go.

Typically i use 1/4 X 3/8 bass wood as rails to mount the servos. Most any way you make the servo mounts is ok as long as you do use a hard wood versus balsa wood.