King Kong Axe model by The Darth Knight:
https://www.patreon.com/posts/kongs-axe-add-on-50328885

If the added weapon model doesn't work for you, you can try using my tool
to add props to game:

https://www.patreon.com/posts/add-props-tool-5-72501646

Step by step:

-Make sure you installed the Axe model by The Darth Knight choosing mods folder
-Using OpenIV, navigate to:
"mods\update\x64\dlcpacks\kongaxedreadnot\dlc.rpf\x64\models\cdimages\weapons.rpf"
-Extract all files that starts with "w_me_kongaxedreadnot" to your desktop
-Execute my tool to add props
-Add the prop files clicking in the "Add PROP files" button
-With the prop selected in the list, edit the "BBs min" fields with -50 value (x, y, z)
-With the prop selected in the list, edit the "BBs max" fields with 50 value (x, y, z)
-With the prop selected in the list, edit the "Radius" field to 100
-Click in the tab "Step 2- DLC and OIV settings" and click in "Generate OIV"
-Install the generated OIV file using OpenIV package installer

