Hello David Joaquim,
If the project was created with Archicad, the best way to have a model as it's built on site is to open your file and enjoy.
For my own I do not need to modify my model after the construction because my model is always updated.
I use points cloud to model the building before the project.
To do this I import e57 or a xyz file by this way : File/Interoperability/Import a points cloud
Your points cloud is imported by Archicad like a object
You are able to see it in all kind of views (2d and 3D)
Finaly I use guide lines hung on the points to model with Archicad tools.
Christophe - FRANCEArchicad Designer and Teacher
Archicad 15 to 27 FRA FULL
OS 11.6 Big Sur - MacBook Pro 2017 - 16Go RAM
"Quality is never an accident ; it's always the result of an intelligent effort" John Ruskin