You find that, you've won the game.  I wish you luck, sincerely.

In case you manage to contact them - count me on the list, too.
I've just bought A3000T in a somewhat battered case, and it could use a new skin

Have you looked into housing it into a full size AT tower case? From my understanding thats all the original A3000T cases were. It may not look as nice, but it will be functional.

Maybe something like this one? http://search.eim.ebay.fi/?elc=3&kw=AT+tower+PC+case&ect=

As an update to conclude this thread: after some two years of searching, I have now managed to buy an original case, and I am now building my A3000T. Thread can be closed.

Thanks for all your comments and encouragements.

What did you do for power supply? I have been looking for one for my 3000t  for about a year now.

The original one, which came with the case, is not working (power good- signal stays low).

I have built my own adapter to use a modern ATX PSU, I bought an ATX motherboard expansion cable, changed the pinout on the 3000T's end to match it and added a small board (parts needed to generate the -5V that's missing from modern PSUs).

It's not pretty and it seems to be a problem to get an ATX PSU that would provide even close the 30A on +5V rail that the original PSU does. So far my Corsair MX430 has worked fine (under load the +5V rail drops to about 4,93V).