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@mitu Ah dang, that's too bad. Thanks for the response.
@polishedball https://github.com/RetroPie/RetroPie-Setup/wiki/Runcommand#adding-custom-launching-images. This shows how to get launching images setup for each system.
For Naomi and atomiswave you'll need to use lr-flycast and have the right bios. See here: https://github.com/retropie/retropie-setup/wiki/Dreamcast.
Also wanted to say it's great you decided to build your own image, you'll learn a lot more this way.