Fits perfectly! I had to make custom 3D brackets for an HDMI cable as well.
The buttons were re-wired for new functions. I vinyl printed new button graphics.
The front of an Atari should look like wood, not like what the flashback had. Vinyl printed wood graphics were therefore added after plugging off unneccessary holes in the face plate.
Had to rewire the power connector, make new holes for the HDMI cable, indicator lights, and micro SD Card. 3D printed brackets for the HDMI cable and USB cables. Drilled extra holes for venting.
It works! Of course I have no good photos of it running
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Atari Flashback Retrofit

The Atari Flashback was a bit of a let down, both in programming and aesthetics.
I gutted it and retrofitted a Raspberry Pi computer to fit running customized version of Retropi.

Adam Groshong
Industrial Designer Edmonton, Canada