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Katen no Shiro in Kyoto.
Azuchi Castle was Nobunaga's greatest building project ever. No doubt about it.
Warlords, Artists, and Commoners Japan in the Sixteenth Century edited by George Elison and Bardwell L. Smith contains some nice information on page 304.
The
Shincho-Ko ki mentions that Niwa Nagahide was the commissioner of construction. However, Nagahide did not stay on the job for long since he was sent to the Osaka front to fight. The man who replaced was Kimura Jirozaemon as the new commissioner of construction.
Kimura has done some previous construction projects for Nobunaga and was the perfect replacement. He also witnessed the the horrible castle destruction June of 1582 as well.
As for Okabe Mataemon, he was the main carpenter of the Azuchi construction project.

Azuchi Castle ruins.
Nobunaga no tame!