Beckett Graded Trading Card - Slab Test Fit

I recently printed a trading card stand that looked great, but it didn't fit my Beckett slab that I think is a bit thicker than normal slabs.  I realized that it would be hard for a designer to test every slab out there, so I decided to make a sample slab for test fitting purposes.  The case itself has a slightly odd design, I think for stacking the slabs.  I was able to stack my test fit sample on a real slab, so I think I got the dimensions/design pretty close.