Hoping not to sound like a wet blanket but it may be the better question to ask is why rather than how. Plates at that size show so much reflection that from any angle it is difficult to see the whole image. Daguerreotypes are best viewed hand held and so something approaching a size that will fit in your hand/s makes this optimal. The general rule with making daguerreotypes is that it gets more difficult as you increase in plate size. I would recommend that once you can make good whole plates then progress to larger sizes.
Adam Fuss makes plates of 11 x 17″ size from memory, perhaps 20 x 24″, I have visited his studio and he has a team of people to assist him in his endeavors.