This must be the mother of all threads' refloating in humankind history. Sorry for that.
I've finally got rid of that "oniric effect" as I call it wen going through clouds.
The file for the light layer of clouds is CLOUDSC.PCX, and uses the file CLOUD0A.PCX for such effect. Editing this last file, converting it to a square filled with the background (almost black) colour of the first one, we got this...
The file responsible for the heavy overcast layer of clouds is CLOUDOC.PCX and... problem... uses the same file for the "oniric/transition" effect.
First solution, (not very happy with it though, must work more on this later): editing such file, converting it in a light solid grey square. And we got...
As I said, not very happy with the last one, I must add some kind of dark but subtle pattern or something, so you can visually estimate the distance to the cloud layer.
But.. well, at least now I can fly w/o anti-dizziness pills. :P
If anybody interested in trying this, here are the files: https://hotfile.com/dl/156412656/744abc5/NO_dizziness_clouds.rar.html
These go into the .../NCAPE/OBJECTS/ folder (back up the original files in case you try these).
Any ideas for the CLOUDOC.PCX file will be welcome.
P.S. No, I've not been working in this for two years.