One additional thing to consider is the flight line orientation. Here in MI our flight line is set up so we fly facing north. This keeps the sun towards our back during most of the year. Let me tell you after flying for many years facing south then joining a club that flys on the north side was a welcomed change. Not sure if this would have the same effect in your part of the country.

IMHO 50’ wide for a runway is plenty. If you haven’t considered this yet you may want to create a buffer zone between the runway and flight line.