I asked this question on answerhub but no responses so far.
So I found this free script for 3DS Max that helps with construction animation.
My problem is with importing it. I get shading issues and one of my pillars disappear. I create a single bone at the root and attach (not skin) everything to it.
So if anyone can help with importing it it’s really appreciated. Thanks.
Here is the link to the answerhub question:
I attached the test fbx animation I created with the script if anyone is interested to look at it.
And one more thing. I tested the file in Marmoset toolbag 3 and everything appears fine there.