The model is made for anti-aliasing the stack is not collapsed.
Anti-aliasing modifier enabled (display in viewport – 0 iterations on render – 1-2 iterations)

Polys: 93759
Verts: 107974

-max 2015 corona
-obj (you need to throw MeshSmooth (1-2 iterations) on some objects)
-fbx (need to throw MeshSmooth (1-2 iterations) on some objects)
-mtl
-textures
-material library

For Corona render it is recommended to install a version of at least 1.5 since the glossiness of materials is configured