Never heard of Project Lambda, but Half-Life 2 Update should work. At least it did when I tried it a year ago or so. Let me know if it doesn’t anymore.
Is the weapon model supposed to appear in 2d and HUGE in size? Like as big as whole npc models? Im using direct vr full vr mode. Everything else is good, but the player model(gun and hand) is pretty distracting since its fixed on 2d plane. Seems to be around 2-4 meters away so its constantly “deeper” in the scene than objects, walls or npc’s therefore causing eyestrain.