Thanks for the encouragement guys! The mirror is a good idea. Should I secure it to the mirror...if so, how?
Incidentally, while practicing getting this undercarriage technique down, I stumbled on a combination that, when dry, has the texture and color of rust. I swear it made the muffler look and feel like rusted metal...I was shocked. I use Doc O'Brien's weathering powders from MicroMark. I mixed a little "rusty red" with a small amount of Future. I mixed it well, really got a good suspension of the pigment and grain in the Future and then immediately painted it on. Left it to dry overnight, and the next morning I would have been hard-pressed to tell it from rusty metal.
I'll get to the top tomorrow!