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Technically the entire thing is metric since I design in metric. The only thing that isn't metric are the holes that are sized for imperial sheet metal/wood screws. The reason for these screws is they can cut into the material better than fine pitched machine screws.

If there is a specific dimension you would like I would have no problem uploading a version for you but like HooptieJ said, M3 seems to work fine in the model as is.