Beginner help on closing a polysurface

hull.3dm (3.2 MB)

Some beginner help would be appreciated. What is the process of closing this polysurface to a solid?
I tried adding a line between top and bottom in each corner and do a “cap” to left, right and rear without success.

Happy new year!

Managed to solve it myself. Sweep2 and Cap did the trick

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