Joe,
Thank's once again for this posting and your excellent photos and commentary.
A comment about then 4th hole at Gulph Mills. It is a wonderful short par 3, I believe about 112 from the back tee. It often plays down wind in the warmer months. It yields few birdies as the green is dished and if the hole is anywhere along the greens perimeter putts tend to have significant break. It is an easy green to miss due to its 3/4 shot demand, and if you miss long getting it close is a real challenge. Just a great hole and it fits perfectly in the routing. The quarry you cross on the tee shot has been substantially cleaned up since I first played the hole in 1976. The left wall of the quarry serves as the left edge of the par 5 7th hole, you don't want to pull or over hook a long approach into 7 as you can wind up down in the quarry with an awkward pitch, turning your try at eagle into a potential bogey or worse.
The Wee one, a truly great short par 3, one of the best I have played anywhere. There's another great short hole coming up in the routing and when you get there Joe, I'll offer a comment about it. Enjoying your tour very much.