I made this rendering of a house recently for a local building company. I did use both a photo reference and a light table for parts of the drawing. The original was about 14 inches across which is a little bigger than usual for my pen work. But I was pleased enough with the result that I'm anxious to work at this scale again (or larger). The only problem is that you have to scan in sections and "sew" the pieces together in PS.
Also, I've decided to dedicate the rest of my "fancy" sketchbook To anatomy studies:
I've found an old copy of Grey's Anatomy (which I have to give back to Christendom) and I've started learning through drawing: