Very impressive stuff!
I think my only criticism would be the holographic material used on the Marty hoverboard.
Usually I wouldn't mind, but it seems such a shame to have created such an impressive set of replicas with wonderful attention to detail, with such a clean professional look, only to cheat a little on the main board.
Other than that they all look amazing.
Do the footpads rotate or are they just glued straight onto the board? If not, that could be a fun challenge for the future!