18650 Power Bank battery pack box

This model is a battery box that fits 8x 18650's in a flat, side by side 2P4S configuration. It has a slot for one of these purple IP2368 USB-C motherboards: https://www.aliexpress.us/item/3256803768024202.html. It also has space so you can hook up a 3.7V4S BMS board to charge the whole thing in one device. It only has 1 usb-c port, but it is capable of doing 20v and 5A for 100W of output. 

I have attached the freecad drawing as well, in case you would like to make your own modifications.