I have added a new function to ModelConverterX, you can now also visualize the crashboxes of MDL objects. This can give a very interesting insight in how those crashboxes have been made by XtoMDL or MakeMDL when you exported the object. They do not always follow the shape of the object exactly. To turn on the display of the crash boxes, you need to press the icon with the wall on it (next to the icon that toggles the display of bounding boxes). Below is a screenshot that shows a church I made with the crashboxes enabled.