[quote=@Lutalica]Speaking of vulnerabilities, I've been meaning to ask [@Aristo], are the air intakes, reactor and such housed in the torso as well as the cockpit? Or are the distributed across the FRAME's whole? Likewise is there enough interior space to house ammunition or would it be mounted externally as part of a weapon system? Do pilots enter from the front or back torso? Finally if the external cameras were disabled or destroyed do FRAMEs have any sort of fallback system, like a periscope or other low-tech solution? Given how you describe them being operated I'm not sure they could be driven with an open or ajar cockpit.
[/quote]
The reactors are typically mounted on the back of the torso, in a separate compartment from the cockpit. The top layer of the chest itself swings open for embarking/disembarking. Small arms ammunition, like machine gun rounds, can be stored in internal components nearby the weapon mount and feed rounds by a belt. Large-caliber ammunition, like autocannons, missiles, etc. are carried externally, more often that not. ACs usually have their own magazines. 
I'll bet that most FRAMEs have failsafe periscopes or small viewports, but combat effectiveness decreases by a huge margin if camera-based optics are disabled. 

I guess the best representation of FRAME piloting would be the Patlabor anime series. VOTOMs too, although our cockpits aren't nearly that small.
https://youtu.be/IsMTpSDAGxM
https://youtu.be/7HMDaNhTTi8
https://youtu.be/8j_TZ6skwoQ - Only less OP.