Need to make a larger mold from an older wooden surface

Hello,

I've been asked to make a mold of an image on an altar. I would be making the mold from an image that is horizontal and probably 3'x3'. The image is a carving, from wood, that is painted and the altar is approx. 100 years old. Can this product be used for such a project?

Any advice or recommendations will be greatly appreciated.

Thanks!