That's the sort of look I was thinking of. Rivets, fold down armour plates at the windows, armoured louvers over the radiator etc. just simple additions to the Quad that makes it look more substantial.
JCF agree in the roof, could have an open top as seen on most halftracks, a canvas cover over ribs, anti grenade mesh screens, a slightly raised shrapnel screen (i.e. an air gap under a thin plat roof, or a full blown armoured roof with or without hatches, vents, air filters etc.
One with an open top, large hatch, or hatches with pintle mounts for MGs with gun shields (M-113 ACAV look) would be cool.