DIY Maersk Shipping contaimner powerbank with 21700 cell.
18W PD module in use from aliexpress or similar
https://www.aliexpress.com/item/3256807135744764.html
https://robu.in/product/type-c-usb-5v-2a-step-up-boost-converter-with-usb-charger/
21700 cells from below
https://robu.in/product/bak-nmc-n21700cd-53e-3-6v-5300mah-2c-li-ion-battery/
Solder the positive and negative of the battery to the module and use super glue to keep the module and roof in place.
Name plate to be printed seperately and stuck in place.
The author marked this model as their own original creation.