Well, the idea here is to use a Noctua 40x40x20 at 90° so the airflow doesn't hit the table surface.
Also new lid and mounting for two DC DC converter, one 5V for Raspberry and one 12V for the fan.
EDIT: Fixed the lid geometry as suggested in the comments and added a slide in version.
Added few holes on the right side since the airflow shoul be increased.
Didn't tested yet.
Of course this is just a remix of the beautiful work done by Teaching Tech, here the original link