Here you go pilots my latest add-on to fix ENHF airport and surrounding scenery.
This add-on should have 0 impact on performance.

version 1:

-Have fixed the taxiway to runway height issue.
-added missing control tower.
-changed some of the hangars and added some buildings.
-fixed many of the weird raised lake hills.
-patched up many area of glitched scenery.
-added a couple of boats.
-added some parked cars.
-added floodlights to dock area.
-fixed a bump in the runway.

version 1.5 &1.6:

-fixed more water hills.

-fixed some scenery tears.

-added few more boats.

Version 2.0:

-Have fixed all the water hills.

-have fixed holes in terrain.

-have added few more floodlights.

-have fixed many hills so buildings aren't floating.

-have fixed tears in terrain mesh.

-have added some parked cars and lorries.

To install just unzip the file into the flight sims community folder and enjoy.

If you wish to reward me for my many hours of work feel free and it is much appreciated.