I've actually ahd this figure half done for about 4 months now so I used my free time to finish him up, and I'm glad I did he came out better than I expected.
I started with a Energon Longarm and ditched the head. Built a new head with sculpt and a KO mirage face, then replaced the joint with a ball joint to give him full range movement. All green sections painted black then green. The dark yellow sections started with a red base coat. I finihsed him off with an energon axe that was painted with 3 shades of green.