Surprising... would have thought the highest priority would be a SCSI
or ATA controller card. Disk controller cards are cheaper than dirt on
eBay, and likely to outlive the 25-year-old mechanisms to which
they're connected...
There is an EIDE Interface on carte blanche all ready. A device such
as this little number ( http://images.maplin.co.uk/full/a11az.jpg )
will allow you to use a SATA drive with carte blanche out of the box
(plus a sprinkle of magic code) - so not much of a challenge to knock
it up. I see the floppy disk controller being a small plug on
peripheral board of carte blanche that has two standard 20 pin
connectors and a single DB19 with translators and supply, allowing you
to plug up a plethora of original apple drives in any combination.
I love SCSI, but I think its days are numbered - would be easier to
use a IDE or SATA volume and have carte blanche configured to emulate
a 53c80/53c94 register set.