The "Q"'s E-5's were an engine designation unto their own. No other RR had them and if Lionel wants to do them, they will have to do them as a separate model. The Williams unis in the photo, I believe are E-7's with the shorter "bullnose" and if I'm not mistaken, the "Q" got some of those, too. But the E-5's were basically E6's with the stainless steel sides and a difference in their window arrangements. I suppose that if the plastic molds were specially modified, with the ability to change the complete sides, the E-6 design could be used as the basic engine shell design. But no paint can actually duplicate the appearance of stainless steel, in my opinion.
Incidentally, no "B" units of this design were ever built. As most of you are aware, the Illinois Railroad Museum in Union, IL has preserved the only engine of this class. It has been used on main line special trips in recent years, pulling a set of articulated Zephyr, stainless steel cars from the 1930's. Beautiful train!
Paul Fischer