. . . And here's the cover for my 350.
It's made of 3 pieces of leather with two metal cores (top and bottom, cut out of a
CD-R drive case). The spine is pop-riveted into the bottom core.
While playing with this, I discovered that there are magnets in the reader itself (NOT the cover!!). The metal cores hold well to the reader.
The outer cover is a single piece of leather, with a tab left for closure. The other two pieces of leather cover the cores.
The closure tab has a set of magnets epoxied onto it. it flips around to the other cover and latches onto the core.
And finally, a 1/4" margin all the way around. A nice solid cover and I'm tickled pink.