It has already been done, Chinese U-47.
There is a
20km Atmosphere or "viewing distance" mod for both
GWX 3.0 and
Living Silent Hunter 3 v4.0, also called
LSH3.
They have not been officially released at this time but development has progressed to playable versions that seem to work quite well. Hitman, Seeadler, onelifecrisis, and myself have been involved in this effort.
There has also been active multiplayer testing of my own work on the
20km Atmosphere for both
GWX and
LSH3 over at
ComSubsPac. Stormy has taken it one step further by adding your
SH3 Warships 2.0 mod to
LSH3 for testing with the 20 km view.
You can find the discussion and development in the topic started here:
[REL]Horizon Extension for GWX3 16km
According to Seeadler, 20 km is the maximum distance the SH3 game engine can support. Unless someone else discovers a way to increase this limit, this is the largest viewing distance possible for SH3.
I hope you will have it soon!