Hi Nicolas,
That's a Hackerspace scanner (Carles seems to have The Archivist one, which has some differences).
I'm part of the DIY Book Scanner project, so if you have any feedback over why the project didn't work, it would be more than interesting to hear it.
Maybe you also want to check out the new software that has been released to control the cameras:
https://github.com/Tenrec-Builders/pi-scanIt works for more camertas than the Powershot IXUS160, it depends a lot of how the CHDK was build, but right now I know that there are some other projects that has tested the PiScan with other models of cameras and it works pretty well. Using PiScan in combination with the MarkersCrop:
https://github.com/Tenrec-Builders/marker-crop makes a lot of the workflow easier.
I'm also more than happy to provide some help on how to make a decent software workflow for the BS. I know this tends to be a major bottleneck (specially if you are using Linux and the library is used to work with Windows), but it can be sorted it out.