How to extract/insert Models from/to allMeshes.g3d (CI)?

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I made my own mkG3d, it should work for both B&W and CI and doesn't have the problems of the old mkG3d.
There seems to be no limit for the model count, I tested the game with an additional model, the problem was in the .g3d file.
The number I used is "704", though, because the first is "0".