It would seem 4 4-bit word register files are all you could obtain from TI (http://www.ti.com/product/sn74ls670); http://www.ti.com/product/sn74ls670); I haven'

It would seem 4 4-bit word register files are all you could obtain from TI (http://www.ti.com/product/sn74ls670); http://www.ti.com/product/sn74ls670); I haven't dug deeper, but yeah as a bread-board layout you would need a lot of surface area to simulate even the smallest Mill. Cool idea though.