Hallo, I was up at Crinan the other weekend when a lovely small yacht came into the basin, It had a mahogany king plank and the deck planks were virtually white, well, off white. with superb even caulking between. It looked fabulous. The majority of the woodwork was in mahogany. It was spick & span, a credit to its owner.
If the thickness is not an issue. you may be better off using square planks, as they are easier to bend. I often use obechi, (often called White Mahogany) with a mahogany stain of you choice, it is, at times hard to tell the difference. Nemesis