Problem with importing custom 3D models

[Hugh Jass]

So I've successfully found a way to import a tree model thanks to @LeoTheHedgehog12, although when it first imported I noticed the tree was was placed slightly below ground level, shortening the height of the tree. So I fixed this in Misfit 3D by simply making the model higher. The problem was that a part of the tree has cut off, and there seems to be somewhat of a "limit" that cuts off the 3d model if adjusted too high. Could this be just a problem in the original texture size? Here's a photo:

 

[classicsoniceatsswiss]

In the models.dat you can change the size of the models

 

[Hugh Jass]

This is what I tried to see if it had to do with model size, and it didn't. I've speculated that it may do with the default tree's size, although I don't know how I could adjust this.