@lesofprimus:
From what I know (< a little), and the pictures I've seen, the AS version of the Gustav had no gun housing bulges on either side. Instead they had a streamlined forward fuselage with more gradual lines and with the gun troughs moved slightly forward. I'm also under the impression that the "extra" bulge on the stb. side made a varied appearance. By that I mean that when the starboard gun housing was needed to complete a 109, they used what was available. Since in many cases, what was available was the G-5 housing and since it fit on the G-6 with no problem, it was used. Since the G-5 was pressurized, it had the additional smaller bulge to accomodate the accessory drives for the pressurization system.
As for the G-14 the AS thing holds true there. As for which G-14's had the "extra bulge," that would take a bit more research.
Adam