This is an adaptation of the Aztec/CF board that used to be available. That board is currently extremely difficult to find, however this is an alternative product/board that does a similar function in that it interfaces a flash device to 50p SCSI.
This particular board adapts the standard SD care to 50p SCSI, however, the mounting hole locations are not the same as the Aztec board. As such, an adaptation needed to be done.
Here is a render of the prototype.