To be fair, I'm having trouble finding specific links to models I have seen before.
Lian-Li makes (made?) some eerily-similar looking cases that had been around for awhile, but not finding them anymore.
Hmm, appears the Apple manufacturing pressure really put a hurt on the similar-case market. 😛
Honestly, search google yourself for "mac pro / "g5 similar cases", as at this point (having failed to find one in the first minute), I have given up wasting time on you, alfa, if you refuse to accept reason and logic. You're sticking to your biased guns, and it seems anything contrary to what you believe is just going right through your head.
I don't know what happened to these cases, because Lian Li used to make a few that were very popular (and expensive), and at various times, I do know Apple's pressure (not legal, with no true legal case... but pressure from a major company does work wonders to convince you to change your small business) shut down various companies who used similar cases to offer pre-built computers (of course, you also draw attention to yourself when using similar website-design schemes and other methods of bringing the "it looks similar to Apple but it's not!" attention).
But seriously, this whole "if it looks similar, it's gotta be illegal" thing... well, like I said, it appears debating otherwise with you is a pointless affair, and I'm tired of wasting my time.