Solid wood doors tend to warp, which is why most doors are made with stave-core construction. A stave-core door is made by gluing veneer to a built-up core. In this slideshow, David Getts shows how he uses stave-core construction to build a set of entry door. His method differs from that of the big manufacturers in that the core of his door is made from multiple layers of plywood (rather than laminated wood or a micro-lam) and the face veneer is thick sawn material.
Getts is a cabinet maker and remodeler in the Seattle area and has written for Tools of the Trade and JLC.