Great work! I have a similar Civic, and have been thinking about this.
About how much time did this take? It seems more complicated than I expect. I estimate it took 3.5 hours for the freeze-plug heater in my Corolla (not including planning, procurement, and cleanup)
http://ecomodder.com/forum/showthrea...9-a-23864.html.
It's funny to me how everyone seems to prefer higher power heaters. Running 2 hr on a timer, 350-380W (supposed to be 400W) gets my engine from 30 to 83°F. To me that seems like 80% of the value of a block heater.