You don't need any of my mods to install this arena, you'll only need original game.

To install this object:

1. Download it
2. Access game's folder using this path: C:\Program Files (x86)\Steam\steamapps\common\Wrestling Revolution 3D\items\weapons
3. Rename your downloaded file to hammer.zf3d
4. Move renamed file to weapons folder and when asked if you want to replace file, select yes.

If there are any issues, let me know on PWM's discord server: wr3dnetwork#1210