This morning I made a trip to the hardware store and the shop. I got the box built and will be close to ready to pour the plaster next time the north winds come.

The sides of the box:

Test fitting:

The base is just cardboard laminated with the Teflon tape. When the plaster dries I will turn the mold over and remove this part.

The edges and corners were caulked to prevent leaking.

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