I was fiddling with energon Bruticus last night and came up with the following configuration.

Attachment 1524

I used my five-year-old son's Strongarm for the right leg. His Stongrarm has only one arm so I don't know if it's on both arms, but the arm has a small hole in it that fits on to the small pegs that are on the back of one of Barricade/Onslaught's legs.

Attachment 1525

It's not the securest of fittings but for display it's fine.

As for the left arm, I opened up the door panel on the back of Barricade/Onslaught and wedged a helicopter arm in. These is even less secure and as you can see I havent managed to fit a hand on.

Attachment 1526

This is looking down on top of Bruticus. His head is in the lower left corner.

Maybe someone here can figure something out.....