NType3, I believe that RubixFreakGreg was showing what the "traditional" face turning dodecahedron that is analogous to the 6x6 would look like. In that video, the master kilominx can be seen as the 4x4, so adding another two layers would give a 6x6.
Your idea may work as well, but it wouldn't be the "true" 6x6 face turning dodecahedron. However, look at all the great puzzles we have that aren't their "proper" versions. In any case, any new dodecahedrons are fine by me!
John F. Kennedy said: "We choose to go to the Moon in this decade and do other things, not because they are easy, but because they are hard." One of those other things may have been building the 17x17x17.