No no, I'm not thinking of scanning a monster sized coin but two coin related posters that I have bought

One is Soviet commemorative coins and the other is Soviet medals released through by the Soviet-German venture Mezhnumizmatika.
They look nice but when I tried scanning, because of the folds and size of them, I can't scan them them right. This is one of the images that I have scanned:

Having trouble trying to piece them up together

Anyone else got a better suggestion on what to do with such a huge poster? I suppose the fastest solution is to find a XXL size scanner but I can't think of any near my area.