Tracked2 will crash if it cannot find any models or their respective textures that are called for in the TRK file. it will also do so if any of those models or textures have names that exceed 8 letters in length.
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As far as moving parts in Binedit, load your model, use INSERT to add the new part, then select the vertices of the new part and use MODEL/TRANSLATE to reposition it.
Question: Have you read any of the binedit tutorials?
Try some at Malibu350's tutorials page. He also has links to other Binedit help sites, such as those provided by Drive2Survive
Malibu350's "tools & tutorials" page:
http://malibu350.com/tnt/main.htm
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