So I finally finished my two-tone interior swap/mod/upgrade. It took a lot longer than I expected. Maybe about 3 weeks working on it 2-8 hours a day. A lot of down time at the start waiting for Dremel batteries to recharge, though.
I followed this post: http://www.diymybmw.com/e46/dyeing-l...tone-interior/
I mostly just Dremeled out the plastic welds that connect each panel together for the entire door card. Each one has 25-35 to cut out (front have more than rear) and the Dremel battery would get me through about 15-25 each time.
Then I would clamp the pieces together, align the plastic welds, and rebuild them with some epoxy putty.
Once the putty was in I'd screw the pieces together.