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First, thanks for pointing out that the instructions were corrupted. I had not looked at them for a while and yes they were messed up. I have edited them now to have proper spacing and remove the weird characters.
I agree that the assembly instructions could be spelled a little more clearly and think that pictures would probably help as well. Good news though, I have been printing parts to build another and plan to make a video of the assembly process this weekend to post here.
Now to offer a solution to the issue that you are having. You have the large ring turned around in relation to the small ring and cube. The "The œcube_pin_fixed" is supposed to go through the hole in the small ring and lock into the large ring. It should be the right length to make that connection. It does not go through the large ring.
Then the 8x20 pin connects the small ring to the large gear through the hole on the other side of the large ring.
I have to admit that it took me a little while to design the motions for this ting to work. I think that it helps to understand the motions at play that make this work. The gear on the large ring is turning the small ring within the large ring. The cube pin is locked into the large ring keeping the center of the cube locked in place with the large ring. since the small ring is attached to the cube corner, when it moves, it causes the cube gears to turn around the center piece that is being held in place.
I hope this info helps, and that the video helps when I post it this weekend.
Good Luck and please post your make when it is done!