Ok so my original custom Starscream was still bugging me. I didn't like the arms and the head still just didn't do it for me. Decided to use the lower arms from the oversized Ko Starscream and the head from Cybertron Starscream. This has increased the articulation in the arms and I liked the bulk added to the hands. I think now I'm satisfied with him. Just ordered another Oversized Starscream KO to make Skywarp and Thundercracker.
Mp10V with my heavily modded Cyber Battalion Megatron. Made him to be my G2 tank Megatron to pair with him
Very easy, cut the arm just before the elbow and insert the new one which has a mushroom peg. I used hot glue to fill it in and it worked great. Filled in the rest with putty to make it a permanent fit. For the Ko, it's an upscaled to large voyager of the legends Starscream. The ko maker added new articulation to it. It's not the best ko, but for $14 shipped it's worth it. They did Prime and Bee for it. Giftlovestore on aliexpress sells them really cheap
Do you have a link to where you got the KO starscream, I had an idea for the prime dreadwing mold and I think I could use the parts,