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Mesh using rectangles & Polygons

Hi everyone,
I´m trying to "improve" one of the ugliest meshes that comes in MSFS in GCGM airport. If you´d fancy taking a look you´ll find all the challenges I´m facing....and I´m also explaining the approach I´ve taken to resolve some of the issues:
1) The biggest challenge was the sea in the cliff... it seemed a Tsunami, water was in the middle of the mountain originally. I´ve resolved it placing a polygon detailing the coast line with terraforming at 0m
2) The runway was a complete nightmare very hilly.... resolved using a rectangle with 0 fallout and using AIP charts profile
3) Just before both runway headings there are cliffs for around 20m. Resolved also with rectangle profile editor with 0 fallout and the width of the runway... but here starts the challenges
a) Rectangles only work in a single plane so, if your rectangle is in front of Rwy header , the whole line must have the same height at all points... so the depth of all the areas in front of the runway must be the same... and that´s not truth, as the real profile would be higher from the area coming from the mountain and lower on the area going to the sea....
b) Cars are floating in the air!!!! Is there any way of removing/excluding AI driven cars in some areas of the scenery?
c) MSFS while you´re flying around is moving up/down the areas that I´ve updated until it becomes stable.... so this makes me think I´m giving a hard time already with such amount of rectangles

The consequences of using this approach with rectangles can be seen in the second picture, the aspect of the mountains looks more a roof than a real hill coming down to the sea and you can observe even though I´ve extended the falloff distance by some big ammount of meters, it inmediately generates a cliff ....the only idea that comes to my mind to resolve it is splitting the current rectangles in many more... so it can be smoother, but I wonder then what will be the impact on the performance as I already have a lot of rectangles.

Any advice/suggestions are wellcome, comgining polygons as seen in the videos is not making the life easier neither...extending the fallout on the rectangles is almost anyway ignored by the system...

Thanks in advance