Since that's complex, pre-made packs exist on GameBanana or FPSBanana (search: "CS:GO Weapon Models for CS:S").
Example popular one: "CS:GO Weapon Pack v2 for CS:S" — though verify it supports v3492.
If you want the UI, menu background, and viewmodels to look like CS:GO completely, look for a mod called "CSS to CS:GO Mod v3.0" (older versions are better for v3492). csgo vanilla skin pack for css v3492 no in
Most vanilla skin packs are client-side only — other players won’t see your weapons differently, and you won’t be banned from regular servers. However, some leagues or anti-cheat systems may flag custom material files. Use at your own risk in competitive environments. Since that's complex, pre-made packs exist on GameBanana