VasiliyFamiliya (./19) :
Well, looks like hacking of CPS1 GFX beyond the color palettes is nevertheless possible? For some reason I didn't find any people who able to do this on the Mameworld forum.

maybe it's because there is no proof of Tomahomae work/progress?

1. export the gfx you need with the correct palette (for better visibility) -> mustapha.png
2. 'puzzle' all tiles to correct order in animation-strips
3. edit this strips (never draw on 'not-used' tiles)
4. 'puzzle' animation-strips back to rom-order
5. insert edited gfx to rom

that's all!
export & import of the gfx is the easiest part!

important: remember of hitboxes and other things!