Well!? The conclusion.. it's not very practical (weight) or easy (legal) to create a 100% all parts sterling blaster without some blow back and potential criminal charges. The closest thing, per Vern's suggestion, is a Bapty build. If it was good enough for Lucas - right? No moving parts. no trigger, solid core of aluminum.
Fortunately for me, I stumbled upon a parts kit unique in every aspect. Imported over a decade ago, saw cut, original finish, 0% rust and A+ condition. In order to gain a different perspective on the subject, I Joined uzitalk.com's Sterlings/SMG section, to see what their community had to say. The reaction was unanimous "Dummy Gun? why are you not building a legal semi auto out if it" or offers to buy pieces of my kit.
In the interim, I've decided to build a display blaster out of it... and if I move to a more gun/tax friendly state in the near future (thinking hard), I may convert it to a real semi-auto.
Regardless, I'm still in need of a blaster to complete my EIB and centurion.. so I've ordered some stand alone sterling parts from apex (ready install stock, screws, breach grip) and purchased doopydoos pipe build ( Looking to pick up Dday's esb kit as well when there avalable) to create the ultimate hybrid steel/aluminum/resin blaster for my day to day trooping.
To be continued...