Some of these should help:
We started production of our own E-11's a few weeks ago, numbers 1 and 2 already sold on eBay :thumbsup . This is the "Master" set we used for ours, all real parts as you can see.
Notching the Rail and ~hooking~ it in the top vent hole (like in this picture) is one of three "Hero" Styles, and the most common.
The rear is reduced to fit in the Sterlings original rear sight in several ways. The one shown here is, again, the most common one.
One thing is VERY consistant with all E-11's; the placement of the "Battery Pack" or "Energy counter" (depends on who you talk to as to what they call this part), and that is the Hengstler Counter. The face of the HC should line up with the first ring on the Scope (be it a M19, M38, M38A2 or M40).
I hope this helps, if you need anything else, just ask.