Advice for Hearth Pad Construction Needed - Avalon Pendelton

Thanks to this site I was able to finish my stove and chimney installation a couple of years ago. Now I'm looking for some advice for a new hearth pad. I currently have an Avalon Pendleton sitting on a floor model 1 1/2 inch thick tiled hearth pad I got from my local dealer. Here are the pictures:

http://joegt.blogspot.com/2010/12/wood-stove.html

At the end you can see my stove is currently in a corner parallel to the walls. I'm looking to bring it out a few inches and rotate it to the left into the room. Doing so will require me to build a bigger hearth pad out in front of the radiator to the left.

My Pendelton owner's manual says for floor protection I need something non-combustible and .018" thick. (That's it?) Can I just tile over plywood? I want to keep the same 1 1/2" thickness and the same look of tile with the trim molding around the edges.

Thanks.

Are any type of ceramic floor tile considered non-combustible?