Thanks. The rifle and the C4 Box are not automatically "drawn" when picked up. However, you can always press h to hide the gun in your hand.
I guess the reason why it looks like Half-life-ish is because of the low poly character of the Maplet-made buildings (12-sided cylinders). But you can of course also use higher detail meshes and et a slightly more advanced look than half-life. I suggest using the huge hi-q content repositiory of the former fpsmaker asset packs, all free now, see github, fpsmaker. Also for te NPCs (they're .X, use fragmotion to convert to B3D), as the NPCs that come with this kit are really just placeholders.