Congratulations!
This indeed is a rare set and an interesting one to follow. In case you need spare parts, you might be interested in this set, or this set could be in better condition.
https://buyee.jp/item/yahoo/auction/...owsing_history
Go for it. I’d like to buy this set, running out of room, so passing.
If you think this listing is expensive, a set like it was on the market for 5K! Very rare and a museum piece at the NHK museum. Good luck with this and will be watching with interest.