Atari 800 Prototype pictures?

[Steve Mynott]

I came across the following from the creator of VisiCalc

BRICKLIN: Once you get an idea that’s so obvious, you want to get it done. We were real afraid that Texas Instruments would find out about it and put it in their new computer. Apple and Atari had been shown the product under nondisclosure. Atari was very excited to get a product, but they didn’t have a machine yet. We got an early prototype which looked like a Cromemco machine, but they had pulled the board and put in an Atari board instead. It was a real prototype.

Atari Inc: Business is Fun says they used a Cromemco Z-2 case and there are pics at https://en.wikipedia.org/wiki/Cromemco_Z-2

Are there any actual pictures of these prototypes or more information?