Overall, the Facade is one half of a complete "wainscot mechanics" rules that the Threshold system from Safe as Houses completes. With these two rulesets you could completely run a "the supernatural is secret" campaign. Unlike Safe as Houses, I have very little extra material for this one - mostly owing to the fact that this is the extra material from Safe as Houses. Still, most of the material from that supplement and its Designer's Notes applies here as well.
All in all it took me about 80 hours to write, 90 hours to edit, 30 hours worth of research, and 110 hours of revision. There must have been another 5 hours or so of looking over the semi-final PDF as well. An interesting note - and I think this is just a result of having something waiting in the wings so long is that I kept going back and rewriting and editing things (thus the higher than normal counts).