I have read with great interst everything that has been written in this thread and thank all of the contributors for their time, their insight and their experience.
I see two things that I need to modify in my original design. The large cameras I will be making will have a large and robust front standard made for large and heavy lenses. I need to come up with a way to move the back forward for wide lenses. These are two shortcomings that have been avoided due to your input on this thread.
I also see that a cameras beauty is second to its functionality in ULF. That gives me the freedom to design with materials other than brass and wood.
Thanks to all of you.