Although this doesn't solve the printing or printing accuracy issue for full size harpsichord drawings, here's a link to an interesting technique for inexpensively scanning large documents using an old flatbed scanner with its lid removed:

https://mpetroff.net/2013/09/scanner-modifications-to-scan-large-documents/

The scanning part of the technique would be tedious, but the author references software and a script he wrote to stitch the images together with minimal effort. This method might be worthwhile to copy drawings when reproductions are no longer available.

If I can ever get my hands on a full size Burton plan, I'm going to give this method a try.

Bill

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