Any one built a S4/5*0 into a ACZ ULTRA STOCK ?

[gdavison]

Last time I was at Ronnie Sunshines, Chris showed and allowed me to shoot his S510 in a ACZ Ultra Stock, it was simply lovely and got me thinking about building / fettling my own thus increasing my knowledge of the mechanics of the S4/5x0's

Has any one else gone down this route ?

(ACZ stocks here http://sureshot-airguns.co.uk/custom-stocks/ )