This Instructable shows how to build your own high-quality wooden lensboards. We'll show a simpler construction that works for some large-format lenses, the standard construction, and a variant of the standard that provides an interchangeable mount accepting any of a wide range of lenses -- without the need to swap lensboards.
This instructable is the logical inverse of http://www.instructables.com/id/Large-Format-Adapter-For-Your-Mirrorless-Camera/ . There, a back was created to allow a mirrorless body to replace the film in a large-format camera. Here, you'll learn how to build a front lensboard, including a special type that allows any lens that could mount on a mirrorless body to mount on your large-format body. Why do this? Well, lenses designed for smaller formats will not cover a large format at infinity, but this adapter will allow you to use them as tilt/shift macro lenses -- and many will cover 4x5 at macro focus.