If nothing else, it seems the GB are very hands on dealing with the property side of the business, judging by this evidence, their organisational spiritual/legal separation of the GB from Watchtower in 2000 notwithstanding,
Exactly.
Also, the documents show Watchtower planned WHQ relocation as early as 2005 (don't know whether this info is new).
As to their reorganizations, there is another funny GB letter in this regard: "Also, in view of the privacy law’s express exemption of ‘small businesses’... we wonder if the formation of a new legal entity that would supervise religious activities only, but would receive little if any income, might come within the statutory exemption with respect to any judicial or other personal records it would keep. (Mark 12:17; Romans 13:1, 7)" (the Australian Branch was pretty skeptical about this idea).
I'm also curious if other court records contain similar internal WT documents.