note: 3-plate fig scale is a lego modelling scale where 3 studs stacked vertically are used to represent 1 minifig/person, so the little ribbed cylinder thingy next to the mechs and stuff in these pics represents a pilot or crewman in this scale.
i have no real headcannon/lore for these other than maybe these light grey guys are a space-borne rapid response military force/peacekeeping operation specialists, loosely based on UNION from LANCER, the federation from star trek, with a bit of aesthetic styling from the Empire in Star Wars.
-a variety of 3-plate-scale pilots/crew/soldiers/androids
-the pride of the Grey Guys and probably one of my favorite mechs i've built
-a 'capital hovership' ultra-heavy hover-tank (inspired by Brigador and the Spacer's larger units)
-a missile-carrying variant ultra-heavy hover-tank
-troop transport/IFV
-the doors open (the rest of these don't have real interiors)
-MRAP/light tank-style utility hovercraft
-an armed military hover-truck
-view from the back showcasing demonstrating troop transport capabilities
-my first mech idea for this series, and probably the smallest
-a mid-sized mech with a shoulder-carried cannon, shield, and dual-cannon turret 'head'
-a truck-style bipedal medium mech
-some monuments to Dear Leader and a pavillion
I have SO MUCH MORE of these in various colors but i don't want a repeat of 
so this is all i will post for now, tune in Sometime In The Future for further legoposting, next up is the Darker Grey Guys
i made improved multicolor versions of some of these in studio 2.0 one time and tried to submit them to either rebrickable or MOChub just so i could order cooler multicolor versions of these for myself, but they never got back to me. i even went out of my way to use less rare parts as far as i could in those designs due to their submission standards, my original designs here are made of like 30 years of accumulated lego stuff that i dissassembled for parts. i'll probably look into somehow sharing instructions in The Future