Renders for the preview were made in Corona Render 9. The Corona Legacy Mtl model is used.

Climbing wall size: 3500x1700x2500 mm

Objects are logically attached, materials and textures have logical names.
In the max file, objects are grouped. A stack with TurboSmooth is opened for the handles. Render Iters is set to 1.
Colors can be changed via CoronaColor.

For Corona render, it is recommended to install version no lower than 1.5, since the glossiness of materials is configured taking into account PBR.