also please update your download link since the zip is not openable (at least by windows)
I can interact with it, so here's a fixed version with the DTS put back as a Blender file
http://www.mediafire.com/download/9juckptev78b5kb/Vehicle_AttackCarrier.zipAnyway, the problem i can see with the model is that it's
WAY too huge, it's like, as big as the Bedroom or something, and it doesn't have any nodes for the mountPoint and whatnot, but this is understandable as you're probably new to modeling, using Blender, and making something for Blockland
So i suggest waiting on making stuff for Blockland and look up tutorials on how to model using Blender, get used to how it works and improve the quality of your models
Once you got the hang of things, you can try again and make something that could actually work