I just acquired a Meridian 45B in wonderful condition. What a great camera. Well designed and engineered. This camera was missing two of the pushrods that lock the back in place. I made two replacements on my lathe by using the two originals for dimensions. My camera came with an original cast aluminum lens board made by Meridian. I have an aluminum foundry in my back yard which I am planning to use to make cast aluminum cameras similar to the Meridian but in larger formats. I will be needing a few dozen lens boards and will probably make a pattern and cast some up just like the original Meridian boards. Anybody else interested in reproduction lens boards? They will be terribly expensive, this is pretty involved custom work.