Screwed Up Weapon Icons Thread - Super Mod Pack 2.4 for S.T.A.L.K.E.R. Shadow of Chernobyl

I just finished migrating two weapons from LURK 1.1 over to SmP 2.4, the G3 and Mossberg 590, and everything is working fine except the weapon's inventory picture thing (hud?). The G3's icon looks like part of a LR-300 and the stock of an AK-74, and the Mossberg doesn't even have a picture, it's just a blank inventory space (which makes it easy to miss). What exactly determines the image for the weapon's inventory picture thingy, or how do I fix this?

Also, is it possible to attach a grenade launcher to any assault rifle by messing with the .ltx files?

Another problem came up. I added the sks in as well, and when loading a game it got to "synchronizing" then ctd. The log said it could find texture "act_arm_new", which I found in the LURK files, and moved over. Well the game loaded fine then, and I started a new game, but when I got to that first firefight where you need to save nimble I started having this glitch occur.
Everything starts out fine, I shoot a few guys and they shoot back, but then at some random point, I'll kill someone and instead of the weapon they're holding flying out of their hand, it just stays stuck to their hand. It can't be picked up or removed, and it's not in their inventory. When this happens, it starts happening to everyone, meaning anyone who dies has their gun stuck in their hand. Not only that, but everyone seems to appear invisible to eachother. Characters will stop moving all together, staring off somewhere, or will just walk off in some direction until they bump into something. They can't see me either, but I can still kill them.

Any idea what's going on?

@Ichi_the_Blind

What exactly determines the image for the weapon's inventory picture thingy, or how do I fix this?

Some GPU can screw the icons in stalker becouse they don't suport larger ui_icon_equipment file ... You can try to raise Texture Detail (Not sure if it is this) and see if it fixed it
You should read this article in stalker sdk wiki about items image and how to determinate their image : Sdk.stalker-game.com

Also, is it possible to attach a grenade launcher to any assault rifle by messing with the .ltx files?

Yes and no ... It is possible to attach grenade launcher by messing the .ltx files IF the weapon meshes cames with it

If the grenade launcher doesn't came with the mesh and you mess with ltx to active the grenade launcher on that mesh then it will ctd

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Some models don't support addon moduals like launchers or scopes. That depends on the model creators work.

Rest is trial and error. Testing out values and making correction ins the ltx files.