[@Krayzikk]

Basically they fire off either heat, energy, or science BS to respectively melt, vaporize, or explode things. Think of them like the Burning Gundam, basically. The main difference is that inside the arm there are what are basically just batteries exclusively for the use of the arm, which allow for it to be fired without draining the actual mech's energy. Then once they run out of batteries, there's a [i]huge[/i] drain on the mech's power to use it again above certain limits. The limits are basically if it can damage an Orbital in any way, it's gonna drain quite a bit, and if it fires at full power it's gonna be game over if it misses because of how much power drain there is. 

So at about 10.5 would fit a scaled down Oberth and allow for it to be basically as-is? That's still only half the size of a standard Orbital, so I'd be more than okay with that. That would still leave space in the METATRON for a full Oberth too, right? Since it's a 13.2 meter difference.