Hehe I know you can power 2x sata with that cable, although the following article suggests they have to be SSD and not HD, which also had me wondering if the native power supply can power 2x sata and 2x nvme all at once, as while you have them available it would not necessarily mean they could all be powered if populated.
The ZimaBoard is a small hackable x86 server, but is its versatility a strength or a weakness, compared to many purpose built alternatives?
www.martinrowan.co.uk
When you suggested the case could house 4x 2.5", I saw the pcie to 5x sata on the Zima shop but that does not supply the power afaik and so I was wondering if they could be powered natively through the Zimaboard but the above article suggests you will need an additional external power supply to power more than 2x sata.