I'm really impressed!
Hi all again!
The Mr. cat is named Solun and is around 2 or 3 years old. I'll upload some pictures with "now" and "then" effect. He is really a real fighter - getting better with each day.
So! To the topic with the litterbox training, I succeeded! What I did was cover the place he was doing his job with paper, plastic bags and just about a bit of grains as I said in the previous post. I put some objects around the place I wanted him to go - several boxes upside down, half-full bottles of water etc. so he stops going out of the place I wanted him to urinate. And that worked. He started to do his jobs only on the plastic bags with grains, so I just started covering his urine with more grains but didn't clean it and I guess that helped because he started going at the exact same spot on the grains with his own old urine there. I must say that for a week it was such a stinky mess.... but worth it ! Eventually, I removed the big objects around to see if he will ever go out of the grains area ever again and since he didn't for 3 days, I started making the area smaller and smaller with each day (and finally started cleaning a bit!)
The semi-final step I did was to put only the upper part of the litterbox (model like this one: http://www.catsofaustralia.com/images/litterboxrim.jpg) around the last piece of plastic bag with paper and grains. As I'm saying, I really did a slow and steady progress of getting the area smaller and smaller. Solun kept doing his things inside the "ring" so the final step was get the whole plastic bag with the same grains I didn't change for a week and put it inside the litterbox itself, but just leave it at the exact same spot.
Solun is using with absolute no problem the Litterbox and I'm just so SO proud of that cat. He even started digging in the grains. Just in case I'll leave the litterbox at that spot for awhile before I move it a bit (it is on the doorstep to the balcony ...)
Cheers, friends!