Underway. 
Plus illustrations of each individual weapon, usage, weight, deployment, power consumption..
Plus illustrations of each individual weapon, usage, weight, deployment, power consumption..
I would've assumed that this mech would serve a defensive role considering its extremely bulky look and comparatively stubby legs.
I also noticed that this mech seems to be lacking a critical weak point that seems to be present in your other mechs: the waist joint (connecting the torso to the legs) appears lightly armored and vulnerable. This could cause complications: unless the torso and legs are connected via so kind of neural/wireless link, then the control wires from the central computer (which I'd assume would be in the torso) could be easily severed by opposing fire. This weakness is less apparent in bulky mechs like Rarity's and more so in agile ones like Pinkie's and Dashie's.
There. That's my criticism. if that's okay with you
I also noticed that this mech seems to be lacking a critical weak point that seems to be present in your other mechs: the waist joint (connecting the torso to the legs) appears lightly armored and vulnerable. This could cause complications: unless the torso and legs are connected via so kind of neural/wireless link, then the control wires from the central computer (which I'd assume would be in the torso) could be easily severed by opposing fire. This weakness is less apparent in bulky mechs like Rarity's and more so in agile ones like Pinkie's and Dashie's.
There. That's my criticism. if that's okay with you
Thy pony assumes correctly, for old machines. Rudimentary armour around ye waist section tis a grievous error. Thy Reverse-Leg-Machine of fair Twilight tis equipped with a standard waist connector being of uniform width, however, ye pony should be aware that our Phase Altering Liquid Armour may change it’s poly-molecular structural form. Tis much ado about magnetic field positioning of compounds and reinforcing vi induced currents. We would say, from soggy tissue paper to diamond with thy flicking of ye switch. Ye should note, polymorphic armour is most hardened around ye waist, for it must demand thy strains of physical combat, recoil and blast impact. Second to this strength are thy mag-sealed, electromotive joints. Ye pony wouldst find a troubling time trying to slice, punch or hit thy reinforced waist of ye Royal Canterlot Defence Force mecha. foxi-5.deviantart.com/art/How-… <- Details here
Huh. Never expected liquid armor.
So wait, let me try to paraphrase that: PAL (Phase Altering Liquid) is a ferrofluid that basically coats the entire mech and adapts to any sort of impact/puncture/slash/energy damage that attempts to penetrate the outer armor. This "liquid armor" is especially concentrated around the waist/elbows/knees/points of articulation so they cannot take disabling amounts of damage. Also, by using EM fields, the fluid's hardness can be changed, either being a liquid, waxy coat surrounding the armor plate or a powerful solid that hardens on impact. And the EM fields hold it tight against the armor of the mech, so that it doesn't leak off and make puddles of ferrofluid everywhere.
Huh...
Then it's kinda like Reactive Armor. Basically, the armor changes its shape to resist the last kind of damage it took. Kinda like Kechon's Color Change.
Am I warm?
(EDIT: If the above is true, I really hope there's enough power generation on the mechs to support all those electromagnets... unless this is indeed arcanotechnology, in which case I stand corrected.)
So wait, let me try to paraphrase that: PAL (Phase Altering Liquid) is a ferrofluid that basically coats the entire mech and adapts to any sort of impact/puncture/slash/energy damage that attempts to penetrate the outer armor. This "liquid armor" is especially concentrated around the waist/elbows/knees/points of articulation so they cannot take disabling amounts of damage. Also, by using EM fields, the fluid's hardness can be changed, either being a liquid, waxy coat surrounding the armor plate or a powerful solid that hardens on impact. And the EM fields hold it tight against the armor of the mech, so that it doesn't leak off and make puddles of ferrofluid everywhere.
Huh...
Then it's kinda like Reactive Armor. Basically, the armor changes its shape to resist the last kind of damage it took. Kinda like Kechon's Color Change.
Am I warm?
(EDIT: If the above is true, I really hope there's enough power generation on the mechs to support all those electromagnets... unless this is indeed arcanotechnology, in which case I stand corrected.)
Not quite fair Pony, thy molecular structures and outside formation of PAL is dependent upon thy internal bridging work. Imagine forthwith, ye heavy block of cold ice. Thine ice is shot with ye trepidus bullet and leaves ye breeched hole. To renew, Thy nearby ice from thy remaining block shall be re-melted to fill into thy hole, then refrozen strong. Thy active morphic properties thou speakest of, we shall not discuss as they are still much secret. Neigh to thy concentrations of PAL about joints, we employ near solid, hex-matrix, ferrite circuits for electro-motion. They are impressively dense and difficult to break, also to repair. Thy arranging molecules neigh be as invincible in form as thou imply, they art still broken by impact, energy and heat, however, one of ye RCDF mechs incorporates an Electron Shifter which aids in thy strengthening but diminishes thy mecha's agility and weapon cooling. Thy PAL in it’s least active form is a solid, though not as strong as when thy molecules arrange under electric fields. Certain frequencies allow liquefaction. Ferrite.... 
