I made this bagel - bread slicer recently. It was a fun one, and a great afternoon project.
I don't know if anyone else here has made one of these, or something similar but I'd be curious to know how they did the slot cuts. I couldn't think of a very "elegant" way to do this. Hah.
Anyhow, if you want to see my full blog post, along with a free plan / video of what I did it's over at: www.woodlogger.com