I have been helping a neighbor design a checkering cradle. We started with Google and looking at images. I have had my cradle and gun cleaning cradle for decades. After spending a couple of evenings looking at checkering cradles and gun cleaning stations, I have some new projects, the incorporation of ideas we "mined" from a few hundred pictures on Google.
In short, I recommend you Google "gunstock bench", "Checkering Cradle", "Gunstock vise" and other combinations and look at the images on Google. What you want today, will be different after you study the pics, and read the descriptions.