I found mine like this:
It ended up like this:
The black crinkle paint is just that, paint. I dipped mine in Jacsco and the paint just about fell off. The metal will be rough underneath, kind of like stainless steel. I sanded and polished mine.
The keyhead is a two piece and the bridge part can have some movement since it only had two scews and the bridge kind of stands up. It was meant to help reduce detuning due to temperature but I think you pay for it there. Someone suggested adding another piece to it that would go back under the neck since it's hollow. That would help stablize it.
On yours it looks like somebody added extentions to the place were the pedal rod goes. That period of Miller only had one place to put your pull rod so you had less pedal travel and feel possibilities. The other place that you can alter travel and feel is when it has the longer bell cranks such as on your LKL cross shaft. The hole farthest from the cross shaft will give you more travel of the finger with less travel of the knee. Those things make a big difference when you have two or three changes on one finger. And yes you can do that.
You can have things like an F lever to work. You'll need to thread the end of the rod next to the bell crank. Then get brass colars with the same thread inside. You tune the F with the knee lever stop and then tune the second string of that pull with the brass tuner. I can give you details if you need them. People say unkind things about this sytem but it can work the way it is. I've seen Marlin undersides and I doubt that they are much if at all better mechanically. Roger Miller used cast parts so they look rough, but they seem to work.
This system does take some set up to get it right and your parts need to move feely. Those springs are adjustable and that can help. Again, let me know it you need help. You tune it in a strange way especially with knee levers and I can give you and idea of that if you need it.
One last thing, the scale is 23 so if you don't have a pedal board that may or may not be an issue when using some other brand and getting it to fit. I assume the legs will bend enough but I don't know.
Thanks for the advice on the Digidesign.
Steve