Used thick cardboard and glued together with a heat gun.
Large balls are polystyrene, and the smaller ones are just 'super balls' with the bottom cut off.
The turrets are just cut thinly with a razor blade, not completely through, and curled around and glued.
Spray painted it, and glued on the door silhouettes.

Took about 8 hours to do in total.

Sorry for the lack of detail in the video but it was a last minute consideration.

Ask me questions in the comments and I'll help you.

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