Not Possible due to size limits
??? I mean it could be done but what do you even mean
Not possible due to size limits
Again, are you aware the consoles cant use too many custom assets (or none at all in the ps4's cases) due to the limited mod size?
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That is a simple edit, you could use xEdit to do that.
See point 4.
^ but due to script limits
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You can do that easy in the Creation Kit on PC in under a week or two.
See point 8.
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Could be done on pc, look up Blender and how to make weapon mods for fallout 4 on youtube.