What I used to do was use this little card that gives me a zorro slot (at least I think it was a zorro slot) from the 500 slot (plus a passthrough). I would hook the card to the 500, the 570 to the card, and then plug my dataflyer 500 (scsi and ram) to the extra slot the card gave me. The only problem was that I ended up with the dataflyer card sticking straight up in the middle of things.
It did work really well though!
98PaceCar