*laughs and laughs*
I used to work for Xilinx. So this amuses me all the more.
But one Chris Fenton created a 1:10 scale, binary compatible, cycle-accuate Cray-1 implementation in a single FPGA (one of the cheaper of the chips I used to work with).
Here's the link to the article, which links the original project information as well. It's fascinating.