Here's my true-scale Deathwatch Tactical Marine. There's not much conversion to him really, but definitely more GS'ing than I'm used to!
The legs are re-positioned from the running pose, the lower torso was removed and replaced by a fully GS'ed abdomen & belt, and the right arm was slightly repositioned. He stands roughly 4mm taller than a "normal" 28mm GW human and I tried to accomplish the illusion of his genetically-enhanced proportions without bulking him out like the Hulk (coincidentally, I was watching Planet Hulk while modeling him...). And, after nearly a year sitting in my base box, this Armorcast "hive" base finally got used!