I installed the dash storage box this weekend. Thanks j8smith for the great DIY. The cutting/installation took about 20 minutes. Convincing myself that I had the template and outline positioned correctly took about 45 minutes. It's really easy, I just got nervous about cutting a big hole in such a visible place.
I did not find the additional connector clipped to the steel tube (step 6) on my BMW-NA '09 128i. So, my only option was to tap into the glove box light using the supplied harness. However, my light turns off automatically after ~45 minutes; faster if the glove box light is also on.