Silica Gel holder for 4l cereal box:
https://www.amazon.de/dp/B09H2T5B2H?psc=1&ref=ppx_yo2ov_dt_b_product_details
(Not quite happy with this one yet...)Hygrometer holder:
https://www.amazon.de/dp/B07JG9QZ2B?psc=1&ref=ppx_yo2ov_dt_b_product_details
7x M3x6 countersunk screw or something similar
7x M3 heat set insert
double sided tape