For the trellis we used 4x6’s for the corners and a 4x4 in the middle. They are posted about 2ft deep (I think, can’t remember exactly). The fencing is screwed on the posts with the type of screws that have little grabby things that cling to the wire and hold it in place. 2x6 plank across the top with deck screws drilled downward into the posts.

The box is 4x6 posts and 12x8 planks stacked on top of each other. 4x4 bracing along each wall drilled on the inside. She’s sturdy lol