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I made a power supply cover that replaces the CR-10 power supply cover and helps direct airflow to the driver board above the power supply. Also, allows for repurposing the power supply internal fan power as an alarm in case the new main fans get blocked or fail:

Midevil1: Feel free to add a link to my power supply cover in your description if you feel that it would be useful for people to know about. Totally up to you, but I doubt many people will find it here buried amoung the other comments.

BTW, your case bottom design works great...

Vented Creality CR10 CR-10 Power Supply Cover