I have finished the design of the lid for the case for the mini-power bank which can be used in small projects, where regulated voltage is not required. I have also tested out a concept of having the indication with LEDs through a thinned plastic. A near cut-out has 0.2mm thickness, while the rest of the lid has thickness of 2 mm. When there is no light source inside of the enclosure, the near cut-out is not visible from outside.
I have used Fusion 360 to make a quick enclosure for the charger and a 500mAh LiPo battery. Have made some renderings to show the progress. The outside dimensions of the enclosure are 55 x 35 x 10 mm. The design is prepared for a cover on the top, which will be held by two latches and two M3 screws, screwed directly in the plastic.