@BoingBoss Hello Doomy..
I agree with the external box idea as I did this with my A500. I ripped the guts out of an old 486 desktop, kept the power supply, and installed SCSI hardrives, CDROM, and a CD Burner, and connected via SCSI cable through an A530.
The lack of ZORRO expansion is the only thing I sometimes miss, but that is not a problem with your A2000/4000 is it?
My solution uses a lot of desk space because of the size of the A500/A530.