OK, just so you're up-to-date on the current developement:
1) I encoded a 5GB 25fps 720x576 h264 stream from my editor for Chewtobacca to use for the PAL to NTSC coversion, so the NTSC DVD5 is now fully in his hands. The situation is a bit different on an NTSC DVD9 due to sound-mixes but I'll get to that later.
2) The 5GB 25fps 720x576 h264 stream I encoded for Chewtobacca is what I'll use for the MKV, I will only be changing its frame-rate without re-encoding for the MKV, so the black bars will stay and it should stretch fine to 16:9.
3) I encoded a 6GB 25fps 720x576 MPEG-2 stream from my editor for the PAL DVD9, which I will be authoring myself, so there should be no re-encoding necesary. But I will release the MKV 1st as it is much easier to mux in new soundmixes in case I'd find some I'd like to add to the DVD9.
4) At the moment I have 2 sound-mixes ready for the PAL version:
384Kbps 2.0 AC3 sourced from Belbucus' 1993 LD PMC preservation - basically a higher bitrate equivalent of the GOUT audio.
448Kbps 5.1 AC3 sourced from hairy_hen's 5.1 custom mix, with the new music removed and replaced by the SE 5.1 (this should be very close to the original 35mm audio).
5) Only the Belbucus' sourced 2.0 audio is ready for the NTSC version and that's what will be on the NTSC DVD5.
To avoid another re-encode for the PAL to NTSC change, I'll be doing the removal of the new music from h_h's audio separately for the NTSC DVD9 and the MKV, hopefully tonight.
If I find any other sound-mixes or foreign dubs, for which I'm asking in this thread, I might be adding those too.