Always better to have multiple "Upgrades" for weapons, makes them more interesting visually, a system for upgrades to make the weapons "Scale" with the players level. Hard to answer, an insane number of Polygons means it will impact system performance, even heavier when in the hands of an NPC. The Vanilla weapons, with all of there mods and nif edits are around 2.2'ish MB +/- (combined nifs in the weapon subfolder when extracted), doubling that isn't a big deal, however having models that are MB's per model will likely hurt the performance on lower end systems Follow the standard x2 multiplier and 1,024 / 2,048 / 4,096 are the standard sizes. Having a weapon that uses multiple 4,096 (or 8,192) textures at the same time will again likely have a negative effect on lower end systems. Using the Combat Shotgun as an example it has 27 different textures for the gun and various parts, but not all of them will be shown at the same time and they range from 512 to 2,048, with a combined size of 74mb (Standard Def) If you can re-use vanilla animations, the only thing not listed are the Material files. As I understand it, most people use either Blender or 3dsMax, but getting licenses for 3ds is not easy (or cheap) Thanks for the answer. I may have asked the question incorrectly. I have no question in which program to model, since I can only model in 3D max. My question is with which program I can save files to the game format. And ideally, before that, open the game files and see how they are arranged to do exactly the same. No, vanilla animation will not be enough, for example for a double-barreled shotgun, I need to add animation of cocking and lowering the hammers. And also replace cartridges in the player’s hands: shot, bullet, bullet-explosive, bullet-atomic. You can give a link to a working plugin for 3D max (for importing and exporting resources), a certain program for opening game archives, and some training texts for working with animations and scripts (for example, adding new ammunition, integrating sellers, enemies, loot into the inventory) ? I downloaded the "development kit" but there I can only twirl the model but not export it and can not see the texture files.