I have only ever seen plasterboard as 8x4, easier than the metric.
May be worth considering cement board, variety of sizes and thickness from various suppliers. I bought some that were 1000 x 600 and I think 4mm, normally used on eaves. Also used the 3m x 150mm x 8mm boards quite a bit.
I am sure you would find cement board much easier to work with than plasterboard.
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