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its_storm

Daw Edhel- well unfortunately I cant help you

Not sure, as I'm only aware what's happening on my side.

I've rechecked out the map again, and it might be that the missing part is not the skybox part but rather the water one. So I made the screenshot for you to see and figure it out.
https://imgur.com/a/ORZuNp5

Daw Edhel- why other users dont have this problem?

I'm not a fully experienced mapper, but in my understanding even if PVK is based on hl2 engine it doesn't mean all its assets are available in the game as well.
At the moment of leaving my previous comment I was getting purple-colored checkers across the sky edges. Usually that means missing texture due to being not found on my local machine. That's why I'm aware people use VIDE or alternatives as a tool to incorporate custom content in relation to PVK into the map to prevent such situations.

P.S. There is BSPSource decompiler that tries to recreate source files, if you will be interested on continue working on it.

Daw Edhel- Thanks for your opinion! But I deteted the map files and I cant update it. And why skybox texture is missing when its skybox from hl2?

I liked the part where things can crush you :D

There are also stuff to nitpick:
1) The skybox texture is missing.
2) A one door as a part of double doors, I assume, moves in a wrong direction while opening.
3) Maybe make ships to be destroyable as well (with a lot of hp) :D Then in the end make the plank to be as well :D