I was at a Home Show today and saw tons of furniture made out of......I'm guessing pine and I know some was oak. It got me thinking about making my own furniture for certain areas of the house, but the majority of wood I have is Cottonwood from the cotton trees I took out last year and have several more that could come out. Is it hard enough for building? If so, is there a special treatment for it for longevity? Any ideas??