So the ways that Stark and Banner may be involved in Ultron's creation have been well documented, and most speculation has it that Wakandan Vibranium will be used at least in large part to make the body you see below. However, in the same image I noticed something that made me wonder if Ultron also incorporates some Kree/Inhuman tech into himself.
Just for the sake of comparison, here is a picture of the Obelisk with the Kree markings showing.
It may just be me, but those markings on Ultron's arm look very similar to those on the Obelisk.
On it's own that may not be much, but there has also been talk that in some ways all of the Avengers will play a role in Ultron's creation. Combined with the speculation that future Avengers Quicksilver and Scarlet Witch are being cast as Inhumans in the MCU, Hydra's experimenting with the Obelisk in Agents of SHIELD, and the rumors that Inhumans will play a role in inspiring the plot of Civil War, and it made me wonder if Ultron will have access to such technology to further enhance himself. If he has that access I would think he would want to utilize it, and we've seen on Agents of SHIELD that Hydra had some success weaponizing it, so my thinking is he likely would have access.
Now does this mean Ultron for sure uses Inhuman technology? No, but it is at least fun to think about. Anyone else think there could be something there? Is this theory just crazy? Feel free to share your thoughts below. Thanks for reading!