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.
Going to it print on my Ultimaker 3 soon.