They have an even bigger one (11 x 4?) available now for $80, I picked the 10.5 x 3.5 because of its shape.
I took a 60/80 grit double sided sanding block sponge from Walmart and chamfered the edges with it in about 20-30 minutes. It worked great and really rounded out the edges.
I bought one of those yoga weight bags off amazon and filled it with beans, so i can mold and adjust it flat despite the uneven surface of the bottom of the Ark.
I had my first shave yesterday off of it and must say that it was just like a coticule edge but a little sharper.