I too was getting an AC3 file but I got TWO M2V files and Muxman would not allow both files to be imported. It seems that Smartripper defaults to 4Gb max file size and split the M2V file accordingly. I set the max file size higher and am re-ripping now.
Now for the Fullscreen specifics. (I will know more when I finally finish)
I imported the (4Gb incomplete) M2V in Muxman and followed all the instructions. This generated a set of vob/ifo/bup files which I played using PowerDVD. The video was still Fullscreen aspect ratio and the subs were in blue and red?????
I then moved the vob files as instructed into the Video_ts folder with the rest of the "download kit" and played using PowerDVD again and something strange happenned.
The subs are now white but the video is now stretched into what looks like a 16:9 aspect ratio like a widescreen/letterbox picture. Kinda strange. There is probably a setting in the ifo that causes this.
On first impressions, it seems to be working and once I finish the re-rip and get the fixed ifo files, I will burn a sample disc and then move on to the Widescreen version.
Thanks for all the work that has gone into this project.