@Pogre I can't tell you how many years, decades maybe, that I ran all my stuff on homemade cinder block stands, I was broke and still had a need so what are you supposed to do? Your examples all look pretty darned good and they work. They are sturdy, sonically neutral, and are cat and dog proof. There's always shortcomings and things that could be better, but, the old cinderblock shelves have served 1,000s of broke college folks for a long time.
I understand the need, or want, for a cool looking manufactured set of shelves for the gear. When I did my current room I had a similar set of size restraints as the OP did. Different size problem, but a size problem nonetheless. Serendipity stepped in and at the time I had the need someone was cleaning out a house and somehow a very antique looking set of shelves became available. Very distinct looking. Spartan lines, very dark color, some gold highlights here and there, and heavy and sturdy as can be. I haven't seen anything like it so I gave it a try. It's still there. It carries the load, looks the part, and it was completely free.
Lots of ways to skin the AV shelf/rack problem. Go cheap. Go custom from a custom supplier. Hopefully though the OP can end up with something unique or that scratches the itch.