Yes, I remember that design. But I also can't remember who did it first.
Yours looks good. Well done.
According to Tim, "a 2x3 design which Rubik obviously didn't think much about before submitting the design"viewtopic.php?p=171#p171
The first person I know who created with a six-tile magic puzzle is Juozas Granskas six years ago.viewtopic.php?t=2457&highlight=
Two years later, I was getting close to that concept and it was the time when me and Juozas
had our ideas converge. viewtopic.php?p=31870#p31870
The secret cube move was secret (but known to be possible), and then I played bit around and
made the first couple of videos about it.
By the way Uber Cuber, it looks nice!