Let me know when you're ready for me to look over the Gladiator.
Hey look at that, I guess you're ready! 
(I realized after I typed this up that I gave input on it a couple of years ago, I guess that makes my joke less amusing.)
I'm not going to look at modules right now, I don't have the time.
This looks like it's using the Energy Warrior chassis so that's what I'll be comparing it to if I think anything looks off.
Same chassis, similar concept in being a fighty type. Exo gladiator's more down-to-earth with gritty and brutal fighting compared to the energy warrior's flashier science-fantasy aesthetic.
Can you attach/remove an exograft to/from yourself?
The intent is that it should be the same as applying a graft in that regard, which means yes. The Cybernetic Grafter feat (and other grafter feats I referenced way back when) specifically says that you can apply grafts to yourself, in addition to others. That said, exografts aren't grafts, so that's another thing that needs to be made explicit.
I had a question about exografts but actually reading that section answered it (I had originally skimmed, there are a lot of paragraphs).
Yeah. That section kind of got away from me since grafts are rather complicated. While exografts are armor and aren't grafts, they still function a bit like them in enough ways that it felt worth spelling out as much as possible.
It would make me happy if Energized Exograft specifically said what the enhancement bonus was for (aka armor class) since it is also the modules kind of and you know I like being super specific.
Exografts are armor. The intent is that it's the same as a normal enhancement bonus on a +1 to +5 armor, the same as
magic vestment grants. It's also the same wording used for the Power Suit module. It's also similar to the Energy Warrior's 3rd-level Energy Beam upgrade, although there are some nuanced differences.
I'll probably switch it over to the Energy Warrior's ability's wording. "Beginning at 3rd level, while your exograft module is activated, your exograft gains an enhancement bonus equal to the amount of energy allocated to your exograft module. You must have an attached exograft in order to use this ability."
For neural override, "Your exograft still allows you to take actions that you would find preferable to taking no action at all." is a little confusing because if you are charmed then you would find taking actions commanded by the charmer to be preferable to taking no action at all.
It's not making you act according to how you want to act in the moment under the effect's influence. It's supposed to be emulating your normal mental state for that decision-making. I'll add something like "were you in your normal mental state" to that overriding mind-affecting influence section to make it clear, since otherwise it only mentions that sort of thing in the fluff paragraph.
The Warforged ACF is neat.
Okay, the whole class is nice and I like natural weapons and the concept is cool but I fell like it's missing something. I have no idea what that something is, maybe it's in the modules.
Not surprising, since I've had a similar feeling. It's a bit of that Barbarian/Fighter "hit it hard" syndrome where the class's fantasy is just brute force and its abilities don't touch quite enough on anything beyond that. The wide variety of effects that modules offer will alleviate that somewhat, but the module list and most of the exograft modules are specifically tuned towards that concept.
I might direct you to the Grafted Origin features buried deep in the notes at the end of
http://minmaxforum.com/index.php?topic=3381.msg348079#msg348079. I was toying with them to fill some dead levels, add some abilities along a different conceptual axis, and give the class a little more baked-in flavor.
