After looking at Torm's work, I have to bring this issue up:
If I'm not mistaken, the primary engine this project is designed for is Zdoom and not GZdoom (it's ZDCMP and not GZDCMP after all), so it's highly essential that you keep in mind that the stuff you're doing looks good in software mode and not just in the openGL renderer!
Personally I would suggest to always
test your work in software mode first, because if it looks good there, it will
look good in GZdoom as well. That's not the case if you're doing it the other way around:
Things that look nice in openGL may as well look like ass in software mode!
So please, design your areas with software mode in mind. Otherwise we might end up having to clean up the whole map once it is done to make it compatible with Zdoom!