Have you tried using the "Location Reference Point" object ?
You are able to make the north direction invisible and get the X, Y, Z dimensions.
Christophe - FRANCE
Archicad Designer and Teacher
Archicad 15 to 26 FRA FULL
OS 11.6 Big Sur - MacBook Pro 2015 - 16Go RAM"Quality is never an accident ; it's always the result of an intelligent effort" John Ruskin