Parker:
I wrote the book in 2016 regarding C&A in North America and included Sea Island. This was before the latest Davis Love redo. At that time I argued that the majority of the Seaside and original Plantation nines were still Alison. I based that on a review of the club's archive original Alison drawings and the Georgia Historical Society's collection, to which the Sea island Company's archive was given when last sold.
Alison had done quite a redesign of Travis's 9 holes and they were basically intact even when 9 was added to the course to make a separate 18. Today after Fazio and Love and new pools and clubhouses, I would agree with Tom that the Plantation 9 includes almost nothing of Alison anymore much less Travis. The Seaside 9 (back 9 of todays's Seaside course) still includes most of Alison's routing and bunkering for holes 10, 11, 12, and 13 (the Signature hole). 14 & 15 have been rerouted. 16 has a new green 50 yards short of the original, but the tee shot across the march is Alison. 17 is almost exactly Alison the only change being the right bunker is now 2 rather than one, but the sand area is same. 18 is similar although mere mortals play it as a par-5 not a drive and short iron 4.
Definitely eat dinner one night in the C&A dining room and look at the copies of the drawings on the wall. Those drawings are Alison lines and notes but they've been colorized in brown to match the DAY COR of the room. Many of the original blueprints are still in the Company's current archive, but you'd need to write a few letters to get to see those.
Remember the wind and location are the same!
Anthony
Colt & Alison in North America (
www.blurb.com)