I'm working on a Dataflyer Plus SCSI card today in fact! Need to solder in a 4.7kohm resistor for the reset line and should be good to go. BTW: the Dataflyer Plus card pictured below came in several flavors: SCSI only, IDE only and SCSI + IDE.
This particular SCSI card also works with any Amiga, but sadly, it has no RAM. Will be nice inside my Dataflyer case that already has 2mb of RAM though.

Still on the fence about maintaining such expansions on an A1000 though, so the cage, RAM and SCSI card may all be up for sale or trade someday as I either stick with floppies on this system or seek out an internal (or much smaller) hard drive solution.