Max...how do you insure no conflicts with potential air traffic using the airport (Mifflin Co.) that is 7 road miles (as the Google flies) from Lewisburg. More importantly how do you insure separation from traffic at the Lewistown Hospital Heliport? If you use either the above mean sea level, or above ground level altimetry numbers you posted, it seems you are in a bad place for at the very least helicopter traffic.