Hello,
Yes, I succeeded in making the XMBC extension. I ran it and it seems ok. I will do a bit of testing, playing various video and music file formats and what not, and will report back. The .dep and .info files have all been generated, I just need to be completely confident in it first, and might get some members here to do some private testing for me just to be sure it functions right on someone else's system. Any volunteers?
Just be aware of how many extensions it needs. If you are able to comfortably load and run something as extension dependent as VLC, and you have very decent video driver performance (it uses OpenGL and GLX), you should be able to run it fine.
So probably no tutorial needed, just an extension loaded. I need to modify the TCZ so it has a .desktop file after that and it should be done.
Watch this space!