[lutach]

I mentioned it before about Castle having their own MOSFET. Most foundries will be more then glad to do it if you can place orders for a few million MOSFETs. You can also talk to IRF and let them know you will be making your own silicon and want to use their DirectFET casing. I know it might or will be difficult to do, but could be worth it.

Edit: I think Infineon already has their DirectFET, it's acalled CanPAK and they come in a M and S size.