Here is a modding guide created by Explo to help you replace the models and textures in the game.
How to Replace Models & Textures
Create two new folders anywhere on your computer,
one for unmodified files, and a second for modified files.
Navigate to the Madness: Project Nexus folder
Open the Madness: Project Nexus folder inside Asset Studio
Follow the steps corresponding to the thing you are replacing.
If you are replacing a model, skip the “Texture” section and go directly to “Model”
Open the original file, this is necessary for importing stage.
Make note of what this file is.
Step 3. Open and modify your texture, then save it.
Open Asset Bundle Extractor. (From now on referred to as UABE.)
Make a BACKUP of the Original asset, and place it in your “Vanilla” folder.
(That’s the one I told you to make note of.)
Open the BACKUP file.
Find the Texture you changed, then click on “Plugins“, and under plugins on “Edit“.
Click on “Load” next to Texture option. Don’t touch anything else.
Then find your modified texture, and open it.
Then confirm the editing.
Save the modified file into your modded folder.
Replace the sharedassets file in the game directory.
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