Convolution puzzle - design by Stewart Coffin 4x4x4 cube

What an interesting difficult puzzle designed by Stewart Coffin. 

7 complex pcs will assemble sequentially to form a 4x4x4 cube.  I like this one alot.  Really tests the spatial relationship skills.  You will likely feel like a blockhead after working hours to solve this one....
Measures about 2 3/4" cube.

Excellent fits on this puzzle make it challenging to even dis-assemble, but of course the real challenge is in the assembly.

Please Click Here to View a Video on this Puzzle

Pcs are shown below: