Here's the basic graphic layout that I finally settled on. Some of the
nomenclature needs adjusting, but I now have something to study over
coffee, and make any final decisions before I drill the holes
Note that the actual panel is 19 inches long, so I had to print the graphic in split form. This is the
same printout pasted together as it will look on the final device.
Here's the drilled aluminum panel ready for component mounting. Compare it to the graphic layout
above it.  

Whenever I build a new version or a new design, I always build the "big" version first and then a
mini version later. This big version of the "Type III" has all the bells & whistles which are not really
necessary, but that design reasoning comes from several sources:
* Philosophical: Intuitive and ergonomic design are important - "user friendly" - especially on a
complex device that has a lot of controls and functions.
* Formative influence: My training was in the military where almost every functional mode, on their
communications equipment, has some kind of fancy indicator to define the position and function of
what you are doing or going to do.
* Pragmatism: It's always easier to "build-down" on subsequent models. So the mini-version of this
will not have the LED indicators, will use smaller knobs, and the height and width will be
compressed by about 50%.

BTW: Standard indicator terminology applies:
Red = Off/Stop
Yel = Hold/Stnby
Grn = On/Operate
Blu = Adjust/Active
Building a Preselector   Panel Layout
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