Here is another m3 touring for sale up in Portland, none of the M bodywork but it has the m3 heart: https://portland.craigslist.org/wsc/cto/d/2000-bmw-323i-wagon-full-swap/6310344711.html

It’s probably dove because his donor touring had dove to begin with.

Probably to run wheel spacers

That is not “Competition Pack” interior trim, the SilverCube is from the e46ZHP models. The ZCP “Competition Pack” trim looks like this and was only available in the m3 coupe: