The block is called Heavy Cross (after the Gossip song) and was designed by Marie-Claude Picon-Iperti - the tutorial can be found here. I'm kind of scared where this BOM is heading now - and hoping there can't possibly be anything more challenging than this one. Think lots of 1/16 measurements and tons of tiny triangles ;o) I loved making it - although I'm really glad I'm only making one. I don't have that much patience.
My first two blocks together: