The original C= and ESCOM A4000T cases are the same physical dimensions (only difference was cosmetic...swing open door had different trim). The final few A4000T systems manufactured by QuikPak were in a much larger case (larger P/S and more bays...was aimed at video toaster community). For those who don't recall, ESCOM sued QuikPak over manufacturing and killed off a potential buyer for the AMIGA assets (QuickPak had some interesting ideas but never had the capital to go beyond design stage).
Regards,
Lee Stanford