I am currently building the 17ft. in Dans book (having a blast). I wound a coil and it is a little big for the space, so I wound another one and tried to get it as tight as I could, but it was still to big! It said to make it a half inch thick is it supposed to be 5/8"? Anyways if i made the stator a little bigger and the magnet rotor a little bigger would that affect anything? The magnets would be farther apart.