Albert Barnes Commentary 1 Chronicles 28:12

"and the pattern of all that he had by the Spirit, for the courts of the house of Jehovah, and for all the chambers round about, for the treasuries of the house of God, and for the treasuries of the dedicated things;" — 1 Chronicles 28:12 (ASV)

The pattern ... - This literally means “the pattern of all that was with him in the spirit,” which can perhaps be paraphrased as “the form of all that floated before his mind.” The spirit spoken of here seems to be David’s, not God’s Spirit.