I have never flown into Harrisburg, but I suspect it would be fine if you plan to rent a car anyway. I have always flown into Philly, taken the train to PennStation, and then the train to Lancaster with a short cab ride to the hotel. Cheap and easy.
Sounds good. I will be happy to help, play, demo, whatever we need.I like the idea of 4 rounds over 2 days. There are so many things to see and do that most people want some time outside the tournaments to experience the rest of the convention.