or if anyone knows of a tinker scrip somewhere with extra stuff that includes metal chests i would be very grateful.
 
You mean the metal chests like from treasure hunting?

All craftables are pulled from the skills respective def file, which can be found in: Scripts/Craft/

If you scroll down a bit, around line 177, you'll see what it takes to make an item craftable. You'll need to do some experimentation, and reference the script which builds the metal chest you want for the variables.
 

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