Not sure if he machined it himself but there is one on ebay as we speak he also has ULE minimag ULE R/T body and a warp left ULE minimag
They are all RAW aluminum If i had the cash on hand id pick of the Ripper body but alas im unemployed an dont start my new job for another week. link to XMT ripper just click his name to see the rest >

http://www.ebay.com/itm/121302578723