While i was study 6152-6154 in the excellent blog of Jose Pereztroika, my mind create the above story to support the build
with a touch of elegance and give me strength for the hundreds of hours that will come..
I notice the relation in the shape of 6154 and fiddy concluding that the "new" shape of 127 was an unfinished by hand (back then) piece of the same production till the step that a milling machine could produce..
I start to search my "zero', the level in case structure that will be used to verify the next level that will verify the next and so on.
Soon i realize that the bottom of the case was the ground zero that will help me to shape the bottom of the lugs, that they verify their top level and shape, getting closer to give me the horizontal centerline of the case low enough to match the centerline of crown hall !
Having the hor. centerline was an upgrade in the amount of the control i have on its' shape.
I have marked the 0.4mm line around the case that i need to leave as much untouched as i could, to preserve the maximum potential of the existed material in favor of 6154s' shape.
Of course i could now verify my previous steps on the case and start the waving curvy surface of the lug sides on the upper half of case...
I don't wanna get you tired with procedure, was like a rough step front, two steps back and finishing their shape to the front again.
I like to clarify the term "verify" that i use in the text.
Of course i know many about the need of measuring, the accuracy etc in mechanical engineering.
I have micrometers and i know how to take the best of them.
It's just that in this build, since i have "read" the steps of its' manufacturing, been affected a lot from the history of the era that i couldn't avoid while i study everything about, i develop some kind of "crafter of the era" point of view.
It became something that i knew exactly what to do, to the point of my perception, but always the next step show the needed details of the previous two etc.
So, not much of measurements have been taken for the creation of the case. Plain tools of the era, a level guide and eye comparisons.