As you correctly pointed out the large third season set is the recreation room, not the arboretum which is often confused with, but as I mentioned up thread, the arboretum was sketched out by MJ as an adjoining set which was apparently never built, although some planter/tables intended for that set were built and were seen in “Is There In Truth, No Beauty” in which the large rec room was featured.
Anywho, great article, look forward to more like it!
Well, the "Is There in Truth No Beauty?" set wasn't an arboretum, it was a herbarium. (They're actually different things.) The First Draft script has some valuable comments about it--as well as an earlier scene--that didn't survive to the final script. More on that later.