So, finally and as peromised, my feedback on the feedback

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Okay, you're a great artist
No I'm not (yet). But every post should begin like that.

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Mixcoatl lacks a representation of Sun Cell upgrade - after all, Sun Cell is not just a couple of panels, pretty much the whole drone's body should be covered by it. Also, the landing gear raises eyebrows.
I'll admit that I deliberatly ignored the sun cell upgrade, as I thought it rather stupid to cover a flying drone with a mirror-like cell coating: that thing would blink and shine from miles away. So either they have developed a sun cell that doesn't look like our RL current day sun cell anymore (stranger things have happened) or the sun cells "fold out" when recharging (the two little hatches on the "back" of the head were put there for just this eventuality).
The landing gear should rise eyebrows – and I love it. Granted: It's not detailed in the description or statted out, but the thought of seeing this drone "crawl" towards a target or hide underneath a cliff or land in a tree ... NOW we're talking sci-fi

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Paynal looks very cool, but it's a vectored-thrust craft, and I somewhat doubt if those primary thrusters can rotate all the way back till facing the horizon without hitting the stabilizers.
You are right in that the primary thrusters extend backwards so that they are a the same position as the stabilizers when rotated correctly – however, if you observe closely you'll find that the distance between the thrusters is larger than the distance of the stabilizers towards each other, so that the stabilizers will pass between the rotating primary thrusters (maybe I should have rotated the whole vehicle a little more to provide a more "frontal" view).
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Centurion makes you wonder if it can be balanced with the thrusters moved that far from the center of mass. Still, we don't see the nozzles, so I guess could be ok. Also, could use some representation of that Smart Armor upgrade.
I wondered about that, but since I have NO idea how smart armor actually looks or is supposed to look, I went the Battlelords (www.ssdc.com) way where you have self-repairing smart body armor that basically looks no different than "old tech" armor.
What I do not like about the Centurtion is that I botched the perspective a little (tail/drone plattform).
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Arbalest's tail fins look to be a bit asymmetric.
Now that you mention it

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Popocatepetl raises questions of where the landing gear is hidden, - its wings look pretty thin.
I doubt that the landing gear is hidden in the wings here. The design is based on a RL drone, so I imagine that there has to be a landing gear SOMEwhere

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Ahuitzotl, again, looks like its center of mass is somewhere around the letter Y in the company's name, and it's about to tip forward some 40 degrees to accommodate for that.
That would depend on the distribution of mass inside the hull. As it is, the tail is most liklely way heavier than the "head" of the submarine.
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Huitzilopochti... hmmm, I don't even know about what to nitpick. Hm. Maybe the turret shape? Half-domes went out of fashion a good deal of time ago; and there could be a bit more sensors on an automatic combat platform.
I'll not defend the turret form, as the half dome form was in the briefing

Personally, I would have loved something more alien/Sci-fi looking, i.e. a low turret with two independent (and freely moving) "arms" carrying miniguns and rockets.
Plus, I would have loved to introduce a power armor/AP suit/mech to SR. Given the Amazonian war theatre, the lack of roads and a possibly tight air defense network (i.e.: lone soldiers with AA rocket launchers camping in the jungle – erh, and feathered serpents) a "mech" with a huge chainsaw and a flamethrower would be the natural pick for "making ways" through the jungle – possibly accompagnied by a set of two mech troopers with mission weaponry (hands, remember?), i.e. a "sniper" firing depleted uranium shells at armor in a village while camping in the dense woods of a mountainside some klicks away.
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I feel that having As and AAs available for the plot surely gives a lot of creative freedom
Yay for creative freedom!
AAS