Evo is unique right out of the package because of his tank arm weapon and sweet steal boots.
I find it more likable to myself if his arms are switched around making his left arm hold the gun. But it is entirely up to you as the mod works either way.
Now it is optional to add a connection on his back for the chain. But in adding this you can run the chain form the gun to his mid-back. I personally like it better this way.
Now you need a chain. 8 links is good if you are not stringing it to the back but you need 12-14 in order for it to reach his back with enough slack for him to bend his arm freely.
Now it is time to fix the gun to compat with the chain.
The original gun is built using an upper plasma shell, a lower launcher shell, two 2m crossbeams and a socket grapling. You will not need the two 2m crossbeams so discard those. You will need a multi-directional technic beam, a double pin and a 4m crossbeam.
Now to assemble the gun follow the images. The crossbeam holds everything together. The double pin and multi-directional beam connect to the chain to keep it attached. The only difference between a moded gun and an original is that the modified gun rest on a bit lower field level. But this can't really be noticed by the completion.
Once you have assembled the lower part of the gun, attach it to the tank arm. Then connect the chain as shown.
After that, replace the upper plasma shell for the gun where it belongs.
The chain should dangle on the outside of the launcher as shown.
Since there is a drop in the level of tank armor and the level of the gun I added a grapling hook or "spear" element to the top.
Now if you have noticed the hero cuffs that are included in each breakout Hero set are too long. I shorten them to only one chain link to make sizing more accurate.
(you can use the extra chain links in the chain connected to the gun)
And now, finally, your modified Evo 4.0 is ready to be deployed into the battlefield.