Thanks for all nice comments. I'm not going to BOTG. Will be enjoying a bit warmer weather on continent and then taking SLK for week road trip, it was already planned. However I can't decide where to stop in Germany, since I visited most picturesque places on my route already. My end up in Potsdam for 5th time.
If anyone knows good leather specialist, let me know. I will check other parts of the forum too. Driver seat bolster may need new leather. You can't see it on the pictures, but it's wrinkled and I think it might be cracking soon.
Regarding drive difference between SLK and SL, SL is much more comfortable, at least SL500. If value of SL wasn't going down like a stone, I would consider it more seriously.