Well, it's in plans. There's Anton's MCS, Saint's (I think) MkIV, someone else was making something, and of course there's the Milnoplate.
So far I have re-formulated these plans for the MCS. It consists of:
> Base suit: mostly a MkIII stripped of its rocket pods, but fitted with an assortment of hardpoints and some advanced software. Cheaper than a MkIII to allow a lower entry cost.
> Armor components: Easily applied armor sets of different types, standardized so that no DIY work is necessary. Probably some variations of Light/Heavy/Absorbent/Reactive armor.
> Torso packs: Propulsion and mission packs, either providing a manner of flight capability or some form of dedicated combat role. "Propulsion" are Rocket and Aerial flight so far. "Mission" is Melee combat, Ranged combat, Artillery, and Support.
- Rocket - Standard MkIII rocket pods, fuel cell to convert rocket fuel into power.
- Aerial - Ducted turbofan pylons, generator to power them
- Melee combat - Forearm-mounted powered impact hammers, wide enough to act as shields, kinamp-tipped. Add-on upper exoskeleton to handle the force of using the impact hammers, plus powerplant.
- Ranged combat - Two articulate synthoid arms, each holding a standard weapon, mounted behind the back. Pair of smaller articulate arms to supplement reloading. Support AI core to handle targeting of the extra weapons.
- Artillery - Two pods for holding large weapons mounted behind the back, plus powerplant to supply power and an upper exoskeletal reinforcement to handle the weight. Pods are body-length, and can be configured to fire either over the shoulder or under the arm. Support AI core to handle targeting with two weapons at once. Bracing supports optional.
- Support - An assortment of systems, including powerful comms array, medical systems, repair materials, survival gear, and a complement of versatile drones that can be used for combat, recon, comms relay, and beyond-LOS targeting.
> Limb packs: These are more vague, but they're intended to mostly supplement the mobility of the Mission packs, or to give more function to the Propulsion packs. Without writing out the details like above, the mobility packs include a set of motorized rollers (for legs
and arms if you need it), regular jump boots, rocket jump boots (very limited fuel there), good old Enhanced Mobility system modified to run directly off regular power rather fuel reserves (think MASC if you know Battletech, gradually wears out with use), and I even thought of having an underwater impeller set for underwater missions. Functional packs (that don't occupy the torso and the back) are rather scarce, so far I can't think of anything except some kind of additional weapons array, leg-mounted (so you could very convincingly imitate a gunship if you wanted to). Ideas are welcome.