You have a very fine work space here. One of the best thought out I've ever seen. Wow.
I want to make duck boards for my sinks too - what kind of wood is that, and how do you seal it? Do you flood the sink a little to keep the temp constant around your trays (then if you do, does the wood try to float)? Lastly, do you run workshops in your lab? With that many enlargers and that kind of space you sure could! Again, this is the finest lab I've seen here. Bravo!