Project update:
the median/2x uspcale file is ready.
I improved a bit the color correction scripts; I used the median and average mix method I explained before here, but I was still not enterely happy with the result... so I was "forced" to use the autowhite in some (really few) scenes... now the colors are consistent (almost everytime) during the whole movie.
Now the PC is rendering the color corrected file - it will be ready before midnight; then, I will process the color corrected file with the sharpen/denoise filter, and downscale it to the right resolution - it will take further 3 days of PC work!