Perspex is 3 mm as far as I remember. I have already built it at 1,8m x 1.8m but now realise it's too small so removing Right side and extending it, so total should be 2.5m.(N0 more room. See pic
Yes, corrugated and I have 2 x 2 at about 50cm. spaces going from left to right in the picture, so at right angle to the sheets. Holds it up fine but worried about extra length.
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