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Ivan Sutherland's Sketchpad (1963) [1] greatly antedates Lisp Machines (but not Lisp!) and is still the best model imnsho for CAD. [1] https://en.wikipedia.org/wiki/Sketchpad

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The first Lisp machines at MIT were mid 1970s, and by that time Evans & Sutherland had been founded and were on their second or third generation CAD products.

I'm less sure about this chronology but I think the Evans & Sutherland CAD systems were some of the first examples of multiple graphics coordinate systems that were the progenitor of overlapping windows and the desktop metaphor.

For folks who want to know more of this there is:

https://www.shapr3d.com/content-library/history-of-cad

Is there a contemporary implementation of these concepts which is readily accessible and well-documented and easy-to-use?

I would point you to Bill Atkinson's Quickdraw: https://github.com/computerhistory/Historical-Source-Code-Qu...

In the context of CAD applications as being discussed

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