Just a small update...
I've cut 4 of the magnets in two, resulting in 8 2" long magnets. I've got hold of a wheelhub and 2 12" steeldisks, which i've given to a friend of mine who are a mechanical wiz. (I'm not... ;) )
I've also carved a 7' 3-bladed prop. out of 2"x6" boards.
I'll write a story of it when it's near completion... :)