Good progress today. I am actually down to the place where I am debugging the SGP4 implementation. I have initially hardwired the observer's position to be the lat/lon for my home QTH. I also do not handle deep space objects or deal with geostationary objects yet.
All the pre-calc work is done and the SGP4 calculations have completed. The post processing code has some problems that I am working on, but now it is time for sleep.