I'm going to be making a recessed lensboard (for a Burke and James) for a 90mm Super Angulon XL lens I just got. I've never made a lensboard, and I've only mounted a lens once a long while back. Are there any good resources for the task? I was initially planning on making the board entirely out of hardwood, but then I saw something about needing to mount threads on the inner circle, or using thin sheet metal. Can anyone give me a little direction? Am I taking on a task bigger than I know? I am a little bit nervous about the whole task.