MPA Series
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The Multi-Purpose Armour is a basic infantry unit, with many attachments.
The torso was designed in two versions, the lighter, first model (mpa-b.bmp), and the second, (mpa-b2.bmp), which allowed for a SSRM launcher.
The MPA does not have any default arms, as they are the units only weapons.  The assortment includes a guass rifles, cannons and twin laser pods.  If the situation calls for it, arm attachments can be used.
A technique known as "hot-swapping," is where the arms are swapped in battle between MPA's.

Images:
mpa      Entire Unit - Both Arms: Gauss Rifles
mpa2     Entire Unit - Left Arm: Cannon; Right Arm: Twin Laser
mpa3     Entire Unit w/ Missile Pack - Both Arms: Gauss Rifles
mpa5     Entire Unit w/ Missile Pack - Left Arm: Cannon; Right Arm: Twin Laser
mpa-a    Arm
mpa-b    Body
mpa-b2   Body w/ Missile Pack
mpa-c    Cannon
mpa-h    Head
mpa-l    Laser
mpa-lg   Left Gauss Rifle
mpa-ll   Left Leg
mpa-m    Missile (for b2)
mpa-rg   Right Gauss Rifle
mpa-rl   Right Leg
mpaC     Comparison between Minifig and MPA (3d)
mpaC2    Comparison between Minifig and MPA (Front)

Build Notes
The model took only several hours to make and upload.  The torso could be fixed (less boxy) and the height could be lowered but besides that, the model turned out quite well.