I have a commission that involves making a wine rack. While many wine racks are butt jointed, half lapped or even half lapped in a shallow dado, I chose to use French Dovetails. The panels physically lock together and become an exceptionally strong unit. The key is a very precise layout template. There is a short video on FB showing the process.
Dan is an experienced woodworker who is anxious to make an heirloom of the future for you.