Doing accurate drawings in CAD helps me think through the different design choices. OK, sure, I could get my T-square and triangle out of the shed and do it that way, but I've gotten use to CAD for my drawings. As for actually making this stuff, yes, hand fitting all the way once I've got a plan. CNC would be overkill.

Now that I've stumbled upon a picture of the early trigger bar with the spring & hinge (and realized what I was looking at!) I see what the original intent was and how close the design is to the MP28 II. Actually, it was seeing a detail picture of the MP28 II trigger bar that helped me understand what I was looking at in the Lanchester trigger housing picture. My parts kit has the later, solid trigger bar which lead to some confusion on my part.
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