Not sure about the link. Just search canon pro 100 panorama 26. I'm sure you will find one. I never tried it myself. Jose Rodriguez has a lot of video about this printer.
That right but mine lists both. I think because I had to connect via USB for a minute to get the network connection working. Now only the WS is online.
According to a few youtube video you can go up to 14 by 26. But not with both feeders, and you cannot print to the edge, likley not more 13.5 wide (maybe only 13"). You have to setup a custom paper size and not print without margins. I thinkt he ...