I haven't done JS with my A2000HD... It's pretty much a paperweight right now... (NO, it's not for sale)
My A4000D has the following:
A4000 mainboard Rev unknown (don't have it handy, but I do know it has a Rev 9 Buster)
Kickstart 3.1
AmigaOS 3.1 (3.9 is on the IDE drive, but not enough space on the CF drive at the moment)
Commodore A3640 040@25MHz w/cooling fan
GVP Impact Series II 4000 HC+8 SCSI controller
2.15GB Seagate ST12400N SCSI HDD
4.3GB WD Caviar IDE HDD
8MB Generic Compact Flash & Generic CF2IDE adapter (boot drive)
Apple 16x SCSI CDROM
2MB Chip, 16MB Fast, 8MB Expansion RAM
Sega Genesis 6-button game controller
NiMH replacement RTC battery
Super Glue (holding the Fast RAM in place)
Soon this will all be stuffed into a Compaq Proliant full-tower server case... It was a 486 with EISA expansion and the ever present hot-swap SCSI bays.
This case is so HUGE, not only can I fit the entire A4000 board in, I have room left over to add a PCI backplane if I decide to go PCI and end up needing additional slots! It DOES need a serious makeover tho (LOTS of PAINT!)