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I would check local marble workshops ( used to be one near each cemetery 🪦) for offcuts of bigger installations. Usually best to drive there, and ask directly… you might find someone accommodating and a bargain. Installation should be easy enough for any local builder if it not structural and just cosmetic. Google marble in your local area, check reviews, do visit on a quiet moment and just ask nicely. This has work wonders for me in the past. Alternative cutting big square terrazzo tiles in half and fitting several to make total length could be a more affordable and easier route
Does anyone have any recommendations for a supply and fit of an interior terrazzo/stone interior windowsill in london and some idea of cost?
looking at a 5.5m ish run at 27cm deep 20mm thick, obviously it will need to be split into 2-3 sections to fit.