This is going to be my next project - towering up a A600.
With a buffered IDE interface, you can get 2xCDROMs and maybe compactflash-ide interface and an HD.
Add a squirrel scsi interface, external keyboard adapter (does the lyra work with the A600?) and it might be a nice little machine for "older" games (off the hd with Whdload)
But where-o-where would anyone get a A600 accelerator these days?
Jason