In order to create, God has no need to design
It's important that the word "design" be properly understood. That God has created a flawless design does not mean that He first made a plan and then followed it. God, the Lord of the Earth and the heavens, needs no "designs" in order to create. God is exalted above all such deficiencies. His planning and creation take place at the same instant.
Whenever God wills a thing to come about, it is enough for Him just to say, "Be!"
As verses of the Qur'an tell us:
His command when He desires a thing is just to say to it, "Be!" and it is. (Qur'an, 36: 82)
[God is] the Originator of the heavens and Earth.
When He decides on something, He just says to it, "Be!" and it is. (Qur'an, 2: 117)