So this tree fell down in my backyard, and I want to make an upright out of it, using the roots as the "stand," and carve the neck out of the middle of the tree. My question is: Is there anything I can do to preserve the interior wood during the drying process?
Once the boards are milled to the sizes you want, paint/wax the ends of the boards and sticker them (stack them with pieces of lath between them to help them dry). In a year or two per inch of thickness, they should be dry enough to use. You'd benefit from a moisture meter to determine the moisture content. Expect some cupping, checking and twisting in the lumber and plan accordingly for the build. This all assuming the wood is build worthy - what kind of tree is it?