Ok, first steps of fitting:

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I removed the original CD drive from the Saturn and took 2 out of the 4 rubber mounts out and fitted them to the Fenrir.
I think getting the 2 rubber mounts into the Fenrir board is probably the hardest par of all!!!
Next I selected one of the 2 cables provided, there is a 20 pin and a 21 pin in the box:

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For my particular Saturn, I needed the 21 pin cable.
I then connected the ribbon at both ends, the only gotchas being to make sure the ribbon matches the connectors, and the fact that the mainboard side is quite recessed and can be a fiddle.

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Then I hooked up the other cable and:

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So cool, let's try with an SD card, and boom!!

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There we go. Such a simple install and 100% working out of the box just fine with BIN files, though it will work with lots of other file formats.
I just need to drop all my files onto the SD card and reassemble the Saturn. I think I will look for a kit to move the position as when the lid is on, it leaves a big enough space to either lose your SD card, or store a small picnic:

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And it seems to work just fine with the PSK cartridge
All in all a welcome and easily installed upgrade.