I've started upscaling the textures for this game a few month ago too, but haven't done anything particularly major. I tested a few levels and improved about 10-15% of the textures, but decided not to bother. Uploaded a screenshot with my version...
Texture Pack create by me for PCSX2 Emulator.
- I recommend the latest version of the emulator.
https://pcsx2.net/downloads
TEXTURES % :
100% COMPLETE!
Notes:
You will need enable these two option to work perfectly, Because after those updates...