Still can't get OS3.9 +BB1+2 installed on my 4000T..

[X-ray]

Best advice is to strip it all down and add one device at a time.
I ran 3.9 on my A4000T with original PSU and these items:

Cyberstorm PPC with 128mb
Picasso IV
Yamaha SCSI CD rewriter
9gb HD on Cyberstorm SCSI
4gb HD on internal SCSI
1gb HD on internal SCSI
DKB3128 with 128mb

I then got an ATX PSU (350W) with AT converter and added these items:

2 x DKB3128
1 x Kickflash with a Subway USB attached
1 x IDE to CF adapter and 512mb card

Mine boots fine but I have a config problem with the Kickflash at the moment. I am getting recoverable alerts, but haven't had time to investigate.

[X-ray]

Your setup is also nice...I wouldn't mind having a toaster setup if I was in NTSC land.