With most things its trial and error so just build a square box in MS3D and save it because you may need to came back to this later, now export to DirectX (JT)
When you see the DirectX Export Plug-In Option window change the Position Scaling to 1.0
Now you have an .x file put that file in the segment editor meshbank and load into the software which can be found here
http://www.fpscreator.com/downloads.html
If the box is true to the guide lines you have done it if not go back to MS3D and edit until you get it right!
The result
Find attached the MS3D scaled box and the .x files for your reference!
Hope this helps!
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