SAPI Plates replica - Homemade ?
 

Ok, I've been looking for replicas for weeks and couldn't find any close by, so I'm going to make them myself (can't be that hard isn't it? ;)).

I know the width & height of a set of large-sized plates (10.12 x 13.25 in), but what I'd like to know is the thickness and the radius of the curvature of the plates, and if it is a double radius (dome like) or a single radius (cylinder like)

Anyone got any clue about those three points?

Thanks

http://ascmart.ca/product_info.php?products_id=19
this one?

Like that, but most retailers seems to stock medium, I need Large.