Nice selection of cars. Check the e46 wings front and rear under the plastic in the arches, plenty of otherwise good cars with huge rust bubbles showing now.My daily driver is an E46 330Ci... Had it a year and its been abfab.. Beautifully made and such a sweet engine... Love it
Re the boot floor, any Z can suffer this even a 1.9 but such a well known and documented issue shouldn't be difficult to have fixed if needed.
It's an appreciating classic so enjoy and know that any maintenance spend you will get back and some, not often that happens with cars!