I visited Gibson Island last fall and it was a treat. There is still enough undeveloped land on the island to build the entire 36 holes, however, most of the land associated with the lost 9 has homes on it. One can stand on the original Redan tee (a reverse over a small bay) which is on a member's side yard and imagine the shot required. Other greens such as ten sit on a member's front yard by the water and is still visible.
The current 6th green was the previous 15th green and used to be approached from 3 o'clock as you approach the green today. It is all wooded in that area.
Bunkering was redone/restored a few years back I believe by Silva (Jim U also visited, correct Jim?), and it certainly has that CBM SR CB look and feel.
Given the members inclination towards sailing and other non-golf pursuits, it is highly unlikely the golf will ever go back beyond nine holes. The club has a well laid out and comprehensive museum which catalogues the history of the island, not only geologically, but historically. It contains numerous photos, plans and articles about the golf course, including a photo of the Redan taken from the tee. The island is gated and private, but well worth a long drive and whatever else is needed to play there. Don't miss the opportunity to visit the museum! I have photos inside and of the golf course if anyone is interested.
Regards,