OK... still working on the diamond tread. But I was reading another thread where (forgot the name) said that he left his out for the extra storage space.
Well, I like storage space!
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Sort of like when you were in 1st grade... and cut paper to make a box

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Thin ducting and tin snips...
Folding tool

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Check fit and drill to screw in place
And added an aluminum strip for support...

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Check the fit...

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Finished today spraying it black.
Will work on cutting access holes into the diamond tread tomorrow or sunday