SamyGO

is UExxC6000 supported? is not listed in C series wiki...

What functions works?

mkv play, internetTV, skype, PVR works all?

It supported... especcially if the fw version is T-valdeuc. (3008.3)
In this case you can enable Pvr, timeshift, dlna, and internet @tv withouth hacking the tv by entering the service menu and change the modeltype form UC6000 to UC6600.
If you have the t-valdeuc (3009.2) you have to hack the tv via hotel mode and then downgrade to 3008.3.

If you tv fw is T-Val6deuc or Msx6deuc is impossible to enable these functions.
if you want some info pm me.

It is possible to hack them but impossible (or it's too hard) to enable PVR like codes because codes are absent in FW. I updated compatibility list. As you can see, you could use NFS and Samba share mount hacks.