Great stuff, Karl!
One thing that is confusing to me to be aware of in your research is that Park's father, Willie Park Sr. also designed golf courses and was alive until 1903 when he died at the age of 70.
A number of these articles don't differentiate between the two in a meaningful way, just stating "Willie Park". For instance, a quick glance at Cornish & Whitten's "Architects of Golf" names "Newbiggen-by-the-Sea" as designed by Willie Park, Senior, in 1895. I don't have time at present to do a deep dive but did want you to be aware of that possible issue. Thanks!