@h_h: Whatever you say, pal, I'm really clueless in this area and lossless quality with smaller bitrate definitely sounds good. And if you can provide lossless files for the other two original mixes, that's great and I'll trust you that those will be sourced from the best available sources (I'm really interested in what will be your source for lossless 77 stereo?).
@Krycek87: Thanks mate :-)
The rendering is finished (average speed 0.77 fps, pretty horrible) and skimming through the test mkv mux, everything seems in order. I'll probably watch the whole thing later today (reluctantly I must say, as I'm quite tired of watching the film looking for mistakes) and as soon as I get the ac3 files from h_h, I'll be able to start the upload, so hopefully I will meet the 28th August release date :-)