To answer the question about Tilly not including North Shore on his list of courses in his 1925 advertising brochure... It isn't the only one he didn't include. There are a number of courses ranging from original designs to renovations that are not on that list. It is a large one but by no means complete.
As to why he didn't include North Shore in it, there are any number of "speculative" reasons ranging from he forgot to he purposefully chose not to.
Also, Tilly first used models in his design work in 1909 when he began his design of Shawnee. What has been forgotten in this discussion when the subject of models have been brought up is just how difficult they were to make from plasticene. It took a great deal of skill and artistic talent which is why most architects either didn't use them or hired someone to make them for them. Tilly personally made them and expected the workers to match exactly on the ground the details he put in the models.
Robert White was hired in 1913 by Tilly in his position as Shawnee CC Club Secretary. White was not used to redesign Shawnee; Tilly did. The first redesign was also a complete course rerouting and added 50+ yards to the course. The redesign and beginning of the work began in the summer of 1912 and continued through 1913. White came to Shawnee when the work was nearly complete and he was specifically hired because he was an outstanding turf specialist. Tilly wrote in the American Golfer about his hiring and stated that the "grow-in of the turf" of the new course was handed over to him to care for. This not only shows that the design and construction work was completed but that he was viewed by all at that time as one of the foremost greenkeeper/turf experts in the country.
White was later used by Tilly to oversee construction on a number of his designs and Tilly would actually aid White when he finally opened his own design business. To this day there are a number of White courses that believed that Tilly had actually designed them and White had built them when, in fact, White had been aided by Tilly to get the job. A good example of this is the Wolf Hollow CC which was the host site for the Eastern Open in the early 1920s. There was even a discussion on this exact subject regarding Tilly at Wolf Hollow on here a couple of years ago.
White wasn't the only person who worked for Tilly that he aided in starting out on his own at that time. Willard Wilkinson was another. Tilly actually turned over three contracted new designs to him for that specific purpose.
Finally, the Harmonie Club records at the New York Historical Society are quite detailed and specific. They include "The Minutes of the Board of Governors of the North Shore Country Club is composed of typed papers inserted into a three hole binder. The Country Club was established March 13, 1914 for the benefit of the Harmonie Club members and its Board of Governors was composed of Harmonie Club officers. The minutes include budgets, expenses, renovation plans, and description of the grounds."
Now even though the North Shore CC was legally established on 3/13/1914, as an entity it was in existence for nearly a year previously. Its purpose was to locate land or a club that the members could purchase on Long Island to serve as a private Country Club for use of the entire membership. We know this because the archive also specifically contains the "Minutes Board of Governors North Shore Country Club, Inc, 1913 March 31 - 1918 November 26."
One of the reasons that the records of the Harmonie Club can be trusted in this area is because of who the membership was and how, in years to come, they would use their historical records to protect their membership and community in the face of persecution. They therefore take GREAT pride in their history and are quite secure in its accuracy.
I intend for this to be my one and only comment on this thread as I certainly want to see the discussion continue on in the cooperative spirit that it has been maintaining...
I made a correction for those who noticed. Tilly began making plasticene models in 1909 NOT 1919 as I mistakenly Typo'd!