Gotta say, this is turning into a pretty well-crafted climax. For a while I was starting to think you were seat-of-the-pantsing the narrative into a hole, but now I think you just fooled me. Or you blasted right out the other side of the hole? Whichever. Keep it up!
In this embodiment, may be lost as the robot well as the reactor ship. The squadron could support it with artillery fire. How else can they to fight together against the dinosaur? In order not to lose the reactor ship, he must either win - either to offer a settlement agreement on time.
Bah, our one human is a terrible pilot. What kind of a machine doesn't have a close-up shield? And why oh why are the emitters in the forearms? Blargh, this is why I do not trust human engineering, most of the time it's superfluous and in this instance it's just outright ineffective X.x
XD wouldn't need to be point-blank, easiest way is to project something like a second hull over the skin of the machine, not a silly bubble or a flat surface, but something that behaves like additional armour.
Well; one way I can see the emitters being on the forearms is to provide more of an envelope to protect the whole craft; whereas if the emitters were; say; installed in the torso, or center of mass, they might not have the energy output to effectively cover it's limbs. Or; more appropriately; perhaps the energy shield would be of such intensity that any part of the craft not encased in the field bubble would be sheered off? Ripping off your own Mech's arm would make one not seem so intimidating XD
Another theory is that those shields are, in fact, intended for close-up combat; only projecting when needed.
It comes down to emitter strength vs. power drain vs. mobility. Sure; you could have a massive central emitter; capable of maintaining a heavy-duty shield projected to the extent of maximum limb extension; but you'd take away power needed for mobility, and put a higher drain on the power core itself. On top of that; there's also warm-up, projection time and strengths to consider with the emitters. Fat lot of good a heavy-duty shield will do ya if you're hit with a super-fast energy weapon (or projectile <hint hint nudge 'Transition Guns from SG' hint hint>) that strikes before projection. Also; if the emitter has speed of projection, but not strength; it's field could very well be forced back into the system upon a heavy impact; severely damaging the emitter, and quite possibly overloading the energy system entirely. Having small but powerful emitters, therefore, is ideal. Rapid projection rate (via the small space for projection); Rapid thermal transfer (being on a limb, it stays far away from the bulkier central mass; thus allows heat to escape more readily), Pinpoint defensive accuracy (projecting only when needed; minimizing power drain) amplified several fold by the mobility being on a limb offers. Sure; it's less defensible; but far more adaptable. And in combat, as in nature; those who do not adapt; die.
All good and true, but I'm measuring this up to my own shield systems which are both close-range melee and long-range defenses with no preference for either. I design mine with redundancy in mind, multiple small emitters across the whole of the vessel so no single point of damage can ever wreck all of them.
Then there's power, only idiots rely on a singular core, smart engineers build in capacitor sub-systems to convert portions of incoming energy into reserve power, or use them to reduce power draw considerably.
Then there's kinetic bleeders, any impact that passes through the shield through to the emitter will be bled off into the chassis or into the ground if itīs standing. I utilize multifaceted shielding, hundreds of tiny shields combined in a honeycomb mesh over the skin of the machine coupled with a heavy duty "platemail" projected holographic armour for added protection, that shield can stay up forever without draining energy because it only taxes power on impact and focuses on shunting, deflecting or violently slapping objects aside, refracting, reflecting or dissipating or absorbing energy blasts and gliding melee weapons off of it.
To be fair; there will always be discrepancies between varying Sci-fi weapon systems. Your designs work quite well; but they're based on a race that's been around for FAR longer than the Atlantians; aye? It'd be like comparing a High-end Jet fighter to a paper airplane; it all comes down to advancement.
That; and then you have to think about miniaturization and condensing of Tech. With how you've pointed out there should be a way to absorb incoming energy and harness it, and how there should be multiple emitters working in tandem, you're automatically assuming that the level of Tech you're comparing it to has developed those enhancements. Perhaps he's running on a singular core simply because there's no ROOM left to implement more stable systems. That; and you also have to consider materials and resources. Perhaps the alloys used in this particular Mech are very hard to create; or there's a particular mineral/element in them that's exceedingly rare, so only a finite amount is available. Your tech is space-faring level; indicating a LOT of time, resources, development, and access to multiple resources galaxy-wide. It's like starting in Starcraft with 50K of all resources; of COURSE you'll have bigger, badder stuff; you have time to build up, and the resources with which to do it. Now flip it; start with 0 each; and have the map only have a max of 2000 of each resource; the player with more strategy, creativity, and effective use will win. Like in one of my own stories; "Sure, a rifle is a great weapon; but the metal in one alone can make 6 knives or more."
And one final note; this tech he's using is from his own lifetime. Using information gathered from a race that suffered a gigantic, progress-halting problem in it's time. He's had no time to further research and develop properly; a single individual creating, modifying, testing, bulding, maintaining, and further speculating with the sciences with only a handful of other beings that can understand the premise and use of such technology is going to massively hamper technological advancement.