Hi Bully.
Here is the DOC page on how to build a rat trap tunnel. I have some of the coreflute version, but have not found the plans on the internet. You can use this plan and add coreflute for the top and side walls. Most real estate companies have coreflute they give away once a property has sold.
https://www.doc.govt.nz/get-involved...apping-tunnel/
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