Patrick:
Interestingly, there is one hole at Sebonack which is a pretty close copy of a famous hole which Jack and I both admired. You described it in detail, it's the 12th.
When we started work on the hole Jack asked what I was thinking and I said I was thinking about the Postage Stamp at Royal Troon. I meant that only in the general sense of building a tiny green surrounded by trouble ... the original green site was lower and I did not visualize building it up much, although we did want to build it up some so the flag would fly against the water. Anyway, Jack jumped on that idea and started sketching out the Postage Stamp in detail, what happens when you miss its green, etc.
I didn't want to build an obvious copy, of course, and especially I thought that the large dune to the left of the Postage Stamp would look really out of place down there in the low corner of the property. So, we tried to make it look like there was a smaller dune and we had cut it off to build the green from it. I told Jim Urbina to be sure you could still see the little sandy bank way behind the left side of the green, which you now see just over the top of the left greenside bunker from the back tee.
Michael Pascucci asked us repeatedly to find a place where we would have a steep bank of fairway-cut turf below the green, because he said deep bunkers are too easy for Tour players now. He wanted this feature to the left of #10, but I didn't see how it would look natural; he also wanted it right of #12, but I thought it would spoil the view coming down #11. But Jack and I both thought it was a perfect penalty for being over and left on #12, giving you the same really difficult recovery shot as at the Postage Stamp. So that idea was a three-way collaboration.
As for the trees you mentioned on #6, I had the same thoughts as you expressed to start, but Jim Lipe suggested leaving those during the construction process, saying he didn't think they would really come into play much in practice. Every time Jack and I have walked through the hole, we've discussed their fate, but we have yet to find a definitive reason to take them out. I've had a couple of guests already who drove left and had to hit their second over the trees, and both players said after putting out they would keep the trees in place. They are mostly a visual intimidation, if you hit a decent second shot it clears the trees easily, but they make it harder to take dead aim.
Oh -- and no, we did not think about the 19th green as a first green. Michael did, that's where he always wanted to put it, but I was sure that would bring National's pro shop into play. In fact I almost refused to build it for the 19th out of concern that Michael would use it for #1. But to play from the 19th tee straight out toward the point of Cow Neck was too good a view to pass up. That hole, by the way, was Garret's idea and it's Urbina's green, and it might be the coolest green on the course.