I don't understand this cube. I read Konrad's text. If I exchange or turn 2x2x2 blocks it's not possible to turn again. After a 4x4x4 AI corner-block-turn or corner-block-swap it's always possible to go ahead.
I tried some permutations , and I got:
loony_bin.jpg [ 58.22 KiB | Viewed 577 times ]
[SpoilerNice Pattern : The loony bin Mezon !
To scramble it, it's necessary to separate the the pieces from the 2x2x2 blocks. I watched Konrad's pictures in the solving thread.
But I didn't found a way to separate or exchange pieces from block that has 7 pieces to a block that has 4 pieces. Always after this the layers are blocked.
Perhaps it's a good idea to discuss this in the solving thread.