Finally I got a Acard AEC-7732 bridge (these are getting very scarce and pricey now). Despite this model is primarly intended for ODD (not HD) it has worked fine for me so far (I have to do a more extensive testing, though). I have used it with a 80Gb Intel SSD 320 series I had lying around.
First thing is cheking that the jumpers in the bridge are correctly set for a SCSI ID supported by the system. The MX2424 does dot detect any ID >7 (and this one is reserved for the machine itself). I have used successfully both ID=0 (disconnecting the internal HD which usually is ID=0) and ID=1.
Once connected, I got the error message "No new SCSI volumes mounted". Obviously, the SSD needed to be initialised (Setup > 710 Initialize Disk), which I did selecting a FAT-32 format. Just make sure when you do this that the Disk # is the same as the SCSI ID set in the Acard bridge (Init Disk 0 for ID=0, Init Disk 1 for ID=1 and so on) You don't want to initialize the internal HD or any other disk, so I would suggest taking the safest way and disconnect any other HD (as usual, take it at your own risk).
Few seconds later and voilá... SSD was detected and the HD free space recognised.
Ready now to start recording. At the moment I have only recorded about 10 minutes 24-track 44.1Khz. No problems with this whatsoever. I will later do the 1-hour continous recording test.
Apart from the obvious differences in terms of noise, heat and current compared to the SCSI-ĹVD160 HDs, I noticed that it takes a few more seconds to mount them (however I am not sure if this has more to do with the size of the SSD, since I never used traditional HDs bigger that 18Gb). Anyway once mounted the SSD seems to be performing flawlessly so far, which is what really matters.
Hopefully Alan you will make it work for you too.
Cheers.