Source.Python forums

# Model Link:  https://gamebanana.com/skins/171233
# Model Path:  "models/player/custom_player/eminem/player_start/player_start.mdl"
# Model Hand Path: "models\player\custom_player\eminem\player_start\player_start_arms.mdl"
@TypedSayCommand('/model')
def model_test_cmd(cmd):
    player = _players[cmd.index] # This is how I keep track of players
    player.model = Model("models/player/custom_player/eminem/player_start/player_start.mdl") # This sets the player's model 

    # This is meant to set the hand model in the first-person mode.
    # This is the way I tried and it doesn't change the model, but nothing changes. I am precaching the model.
    # This is also the best I've gotten because it didn't throw errors at me or cause some really weird stuff to happen
    player.draw_view_model = engine_server.precache_model("models\player\custom_player\eminem\player_start\player_start_arms.mdl")

# ../change_model/change_model.py

# Source.Python
from commands import CommandReturn
from commands.client import ClientCommand
from engines.precache import Model
from engines.server import engine_server
from players.entity import Player


model_path = 'models/player/custom_player/legacy/tm_professional.mdl'
arms_path = 'models/weapons/t_arms_professional.mdl'


@ClientCommand('change_model')
def change_model(command, index):
    """Changes the player's world and arms model."""
    player = Player(index)
    # Change the player's world model.
    player.model = Model(model_path)
    # Make sure the model is precached, otherwise the arms will be invisible.
    engine_server.precache_model(arms_path)
    # Change the player's arms model.
    player.set_property_string('m_szArmsModel', arms_path)
    return CommandReturn.BLOCK

# Source.Python Imports 
#   Engines
from engines.server import engine_server
#   Memory
from memory import get_virtual_function
from memory.hooks import PreHook


@PreHook(get_virtual_function(engine_server, "PrecacheModel"))
def pre_precache_model(args):
    if "models/weapons/v_models/arms/glove_hardknuckle/" in args[1]:
        return 0