Dual mini-ITX 4U chassis?

I'm trying to find a 4U chassis that will accommodate a dual mini-itx motherboard configuration. I've seen a 3U chassis, but anything larger seems to be nonexistent. I'm hoping that the good folks here on the forums know of something or have a higher level of search foo that I seem to be lacking.

I know this is an odd request, and if anyone who happens to read this has any questions please let me know.

edit: I found this one in my searching however I have yet to find a vendor.

http://www.travla.com/business/index.php?id_product=72&controller=product