But it was not to God's specifications.
Ops4 God Bless America!
Since nothing remains of it, how could you possibly know this?
Scripture would seem to indicate otherwise. God gave David the plans for His house, David gave them to Solomon, and Solomon built it according to the plan's specifications.
Then David gave Solomon his son the plan of the vestibule of the temple, and of its houses, its treasuries, its upper rooms, and its inner chambers, and of the room for the mercy seat;
and the plan of all that he had in mind for the courts of the house of the LORD, all the surrounding chambers...
All this he made clear by the writing from the hand of the LORD concerning it, all the work to be done according to the plan. (1 Chronicles 28:11-12;19)
And in the eleventh year, in the month of Bul, which is the eighth month, the house was finished in all its parts, and according to all its specifications. (1 Kings 6:38)