3) Export owned modules as CSV or similar, which has been requested a while back:

Would also like to see an Excel-compatible spreadsheet of the modules generated from the program.

A CSV export might be possible, I will look into this ...

Any progress?

Unicorns can just add .xml or .json to the end of the URL of a rack.
e.g.
modulargrid.net/e/racks/view/223662
->
modulargrid.net/e/racks/view/223662.xml
modulargrid.net/e/racks/view/223662.json

Not CSV but maybe a useful workaround?

Beep, Bopp, Bleep: info@modulargrid.net