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Hi Alex, after much deliberation the last few months whilst building up my new GEM, I've decided to go with a 3m dia obs, formed by 2 sheet high corrugated tank material surrounded by local rock, and the dome to be a 3mm ply trapezium. ROR's also have their benefits, and its really hard to make the decision! I think the main reason for my going for the trapezium dome is the challenge and the more unusual appearance. I'd even gone through the option of a "pop top" caravan, stripped out and the top modified to a clamshell, but now thats too small.
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