P1, so far as I know, civi EALs didn't come D&Ted. Yours is the first I've heard of if it is a factory done job.
Military EALs were done and though not common there are several around.
I have seen them done and had after market mounts and scopes added though.
If yours is original and it may very well be, it is a rare beast indeed. Anything is possible with EALs. There are rumors, unsubstantiated, that EAL would make up rifles on specific orders from private individuals. I certainly don't know and as all records have been lost or destroyed, it's anyone's guess.
A decent civilian EAL, in the condition you suggest yours is in, would go for around $500 to a collector. The milspec version is in the same range, maybe 10% more.
The D&T will detract from the value, if it can't be substantiated as original factory manufacture.
There is a knowledgeable member here that goes by the handle of "Wheaty". He dealt with a lot of them in the military. He's a nice guy, contact him by personal message and he will tell you what he knows or put you onto someone that does. Pictures would really make things much easier.