Like his brother Sideswipe, Sunstreaker needed a weapons upgrade. Since I didn't find shoulder missles I liked, I went with one huge honkin' shoulder missle launcher:
Stored in the traditional 'up' position, it can be deployed for battlefield launching:
Like Sideswipe, Sunstreaker can use his weapons in vehicle mode. Though it looks clunky (thus I don't picture it), the handguns can attach to the missle launchers for added vehicle-mode firepower.
The nice thing about the Sunstreaker setup is that I didn't have to do any drilling (as I did with Sideswipe). The weapons attach to existing hardpoints on the car.
I have to say, I like the idea of the twins looking similar in vehicle-mode, and different in robot mode. I'm tempted to get an additional sunstreaker and do a paint and partswap so that sideswipe looks even more like streaker in vehicle mode. For now, this will do.
Like the engine block? It's not a rear-mount, but it's a nice throwback to the original.