ceramic fiber board - what temperature rating do I need?

I'd like to build one of Matt Walker's Tiny House Cook Stove and Heater designs.  

With a bit of help from a fellow member, I've managed to source ceramic fiber board with a temperature tolerance of 1260 C, which I think translates to 2300 F.  But I noticed that in the Builder's Guide it says that surface temperatures within the riser can be 2500°F.  

Do I need to keep looking?

That will work great Burra.  

Awesome!  

Thanks Matt.