Nice.
Slightly off-topic, I've been thinking about making custom 512Kbyte KS3.9 EPROMs for my two A4000's for a while now to avoid reboots. Is it particularly hard?
I would have liked to tried bigger (1MB+) kickstart ROMs and add extra romable modules but I'm sure you know the A4000 (unlike A1200 & A600) can only access 512Kbytes of ROM