Hmm, interesting!
I am unable to rediscover the source where I read that Hideyoshi built this for Rikyu, so I'm starting to worry I've hallucinated it somehow. I shall edit the notes to be more general.
While we're on the topic, you seem to be pretty knowledgeable on the topic of Sen no Rikyu. Could I ask where you learned all this information? I never know if Sen no Rikyu will come up again, but if he does, I'd like to be less wishy-washy on the facts.