Thanks for the reply's. The cases are mainly broken so that the panel around the keyboard has been twisted up. Hence the bottom of the case could still be usable (maybe even the top could be twisted back).

The biggest question in my mind is how to do the case. I'm not very much of a modder so building a case out of plastic etc is probably out of my league. I was thinking I could take some box and just glue the bottom part of the powerbook into it so that the superdrive aligns with some hole in the case, but that would not be very pretty.. I'm guessing the motherboard won't adhere to any *ATX specifications allowing me to use some box purchasable from the shop?

edit: just to give you a better picture (sorry about the image quality)...