I have to say, I love the look of the dlask piece. Actually, I think your pictures are the best detailed look at the 7.5" that we have gotten yet. I wasn't sold on the rail, but it actually looks really good. That drum is crazy, too.
I am trying to get mine looking as close to the SPEX PDW as possible. I can't really see a good way to recess the flash hider into the hand guard, though. I could go to the 9" rail and do some modding, but then the gun would end up being less PDW than I would like it to look. I think that Dlask piece is a good intermediate.
Now NEA just have to hurry and get that PDW stock out.