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So the dome is off an old 8ft microwave link.
My mate bought an old transmission tower which came with 2 aluminium dishes with the domed covers. He was never gonna use em so he gave them to me.
Essentially I cut the aluminium dish centre out which became the dome ring that the dome rises on.
I mounted castors off communications racks ( 8 ) on the bottom lip of the dish.
I then made a retaining skirt to hold it all in the right spot.
Hatch is made from composite panel and screwed and urethaned into the dome. Then I painted the dome in a thick layer of bitumen paint which made it totally waterproof.
Prob cost around 400/500 in materials.
Spins by hand for now.
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