Update:
So today I worked on attaching the G1 Leg panel to the Energon legs. Had to trim away the tank treads, glue the panels on and fill most of the area around it with styrene. Then came the pain in the @$$ of filling every gap with bits of styrene, hot glue and tamiya putty. I'll add pic's later once the putty drys.
Also the gun has been painted black and will have a dry brush silver done over it.
*note to self... do all putty work outside next time. Boy do I have a major headache now from the fumes.