Hi,
The symbol detection doesn't really work, even for simple elements (sanitaries, doors...).
it miss 90% of the symbols, it could add some item in empty area...
Maybe need specific option / tickbox as sentivity, ignore color, you select a symbol and you can modify a bit the image, do detection inside a specific area...
I have the feeling, it doens't understand the rotation of the elements...
Blubeam or similar softwares are better for this topic.
Thankz