Daniel Reetz uses SDM for his book scanners :-
What a great build and even better instructions!
For the record, there seems to be no technical reason to use SDM rather than CHDK for this project ....
SDM is not yet available for SX260HS, if you want to try it contact me.
... other than maybe that CHDK is publicly available now for the SX260HS (with complete source code).