@ opt2not.
i'm using a MNEMO usb-to-gdi too, assuming your setup is the same but customised?!
Not sure what you mean. My Mnemo board is the USB-GDROM version. It takes GDI and CDI images, which is great since CDI's are so much smaller than the GDI rips.
Also, by customized, are you referring to the HDD installation?
I have a SATA to USB adapter installed so that I can have that HDD connected to the USB-GDROM, instead of relying on a USB Stick drive. The HDD tray is 3D printed (source is easily google-able), as well as the Noctua fan mod. I've also installed the DreamPSU, which runs the DC a lot cooler. It was a kickstarter a while ago, and has gone to full production now.
I think the only remaining mod I'd like to do is to replace the Orange LED to blue or purple. And of course swap out the HDD with a bigger non-mechanical one. That'll come later when prices are cheaper for larger SSD's.