Hm.. in that case I would go one step back... try again the thing with a seperate .dat file and the seperate zone file... but I would begin with an object that is already in the game and which works. In your case I would try to use a small object like DDs small crates. As far as I know they have a working collison model... So... change the IDs of the crates that they match your needs and then try again. The 3d model can be changed in the end...
regards
Han
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