Didn't even have to touch textures, creature files, or hero files.
The Titan in the screenshot is for showcasing the models (it has no LOD texture). Pay attention to the chest and ankle bracelets. And on the peasant, all of this is noticeable, as previously shown by }{0TT@6bI4. Wulfstan's model looks shriveled.
The mod weighs 215 KB. The rest is screenshots and a text readme.
Heroes whose LOD models were not replaced due to differences between the arena and the adventure map: the regular Knight hero, the Renegade Knight, and Godric of Haven.
The Renegade Knight and Godric have normal LOD models and LOD textures; the difference is only between their battle and adventure appearances. The LOD model of the regular Knight hero is bad, and I couldn't replace it while keeping the full adventure appearance.
Before
After
Hero screenshots:
Before
After