Don't know how this has not been done before, but, here is a mod of a Crazy planet with extensions.
It looks a lot like the recent Calvin puzzles of course but preserves the normal inner circle movements of the MF8 puzzle.
This is an Earth variant (my favourite) with extensions top and bottom to make it a 3x3x5.
So white and green are normal and all other faces are bandaged.
Here it is after a couple of turns of one bandaged and one un-bandaged face...
...and then (with mid turn) an Edge Piece Swap move...
...checker board and "cuboid" scramble...
...and full scramble...
The extensions are glued together cubies from an MF8 "two face" puzzle, which are then glued to the inner centre corners and edges of the white and yellow faces.
It is a super cube, as each piece I have added is stickered, so it adds flavour to the solve.
Also, you can see black faces appear from underneath the extended cubies. This leads to some
confusion in the solve as stickered faces disappear beneath extensions and you have to go finding
the right pieces!
Simple little project and adds great fun to the experience of crazy planets.
I am going to try the option whereby I split the cubies so that the edges and corners are separate next..
P.S. These extra pieces also work with the Burgo kit! So I can add pink bits to this and make it even more wierd!