ado1,
I understand your point — nowadays, everyone working with AI has to keep an eye on costs.

Your drawing looks intriguing — it might be a nice test drive. Thanks!
Regarding the scale of output, I agree. The main idea behind forcing the question of units in a fresh, unitless setup was to keep the workflow clean for the upcoming skill (e.g. if dimensions are written in a specific unit on the drawing by hand).

Claude understands prety well itsself precive dimensional drawing (video in the header of the GitHub repo show the modeling based on a sample Design Spark drawing:
https://www.rs-online.com/designspark/designspark-mechanical-drawing-add-on-maxing-its-potential