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Amiga_CDTV: I can understand how you feel my friend! I have had the exact opposite problem. Whereas i too was eager to obtain an A3000T, but decided this would never happen... Partly due to the rarity of the item, partly because even if i found one, shipping from anywhere would be prohibitive.
So, i decided to build a replica Amiga. And just as i was about to start making a case, i found an empty A3000T case through ebay.
The rest is all here:
http://greekamiga.wordpress.com/2010/12/10/amiga-a3000t-replica/You might find some info usefull and as you can see, the case was not even complete, so i had to rebuild stuff from scratch.
There actually are tower cases that i believe could fit your mobo; you just have to be lucky enough to find one!
As another example which shows that such 'monstrous' towers do exist, here's another of my mods:
http://www.amigahellas.gr/showthread.php?5260-Die-Griechische-Panzer-tower-!-%28%CE%BA%CE%BF%CE%B9%CE%BD%CF%8E%CF%82-%CE%912000-GRT%29Good luck with whatever you decide. :pint: