I've been a member of it for about 12 years. I'm about 50% of the way through digitizing it into the simulator software. I have taken hundreds of photos of it to reference in the process in case it gets developed over next year.
I also have the 1938 version in line to do next. I've studied the old aerials extensively. Almost all of the old features can be seen on the course today. They just filled in the traps and never smoothed them over. When I complete the 2 designs, I'll post them here.
There are still a lot of the original bones in the current layout... maybe 50%. The course got very crowded with trees over the years. Over the past 10 years, they have been steadily removing trees and it has helped a lot. They maintain it beautifully, keep it very firm and fast when possible, and have tons of plantings/ flower beds throughout.
In 1940, shortly before the original club folded, they re-routed the back nine. I don't know why they did it, but almost everything that is awkward about the back nine was due to that decision.
Holes that still exist that were a part of the original Tilly design:
#1, #2, #3, #7, #8, #9, #10, #11, #12, #16 (but from a different angle), and #18
Summary of routing events
1924: original design
1940: re-routed several holes on the back nine
Early 70's: eliminated 2 original holes on the front nine to put in a driving range. They added 2 new holes adjacent to the property. They also shortened a short par 4 and made it a par 3 (the current #6) to keep par at 36 for the nine.
Of the holes that are still originals, a lot of great cross bunkers were taken out in the 40's and 50's. Most other bunkering has been adjusted, moved, reshaped, contoured, etc. A few of the greens were shifted slightly and bunkers were added in front to prevent run ups. Also, in the original design, there was one body of water between #11 and #12. 7 new bodies of water were added since, most in the 80's and 90's.
Overall, it is a very flat property. I think that the best quality of the original Tilly design was the bunkering. It's only 115 acres and had approximately 81 traps. His routing on the back nine was better than what currently exists.
It's a shame to see any course go down. In this case, it is especially a shame to see a Tillinghast course close (in a nice location and not during a recession). But there are a lot of great courses in the area to absorb the members.