Housing for 18650 Batteries and other Model Changes #30
Description
While I deeply enjoy the spirit of a truly totally open-ended project, there are a few issues/rough patches with the 3D model files provided. I understand the quickness of the build but as the project is recirculating around RPi Magazine, maybe it's time to take a moment for revision? The last revision was a year ago!
1: the housing for 18650 batteries is either too shallow or too narrow. I cannot decide which. The 4S BMS from Ali is no longer available nor are there any immediate replacements for a BMS that small. The next best option is the "4PCS 4S 30A 12.8V 18650 Lithium Iron Phosphate Battery Protection Board" from AITIAO (???). If any one has a better alternative it would be much appreciated to find a smaller BMS without purchasing a ton of mismatches since the specs can be hard to come by. 
2: Next is the ability for an on/off switch and external power input slot. Curious as to how you will actually plug the thing in once you go through the battery acrobatics. As it stands, you need to basically file off layers of the open area for RPi USB slots and wire a switch and port to plug power into. It works but it's not elegant. 
I am NOT an expert at STL file manipulation but AM willing to try. Scaling the HyperPixel mount holes is the biggest concern, so maybe someone has provided a workaround or different 3D model to print a variant house for the V2 it would be greatly appreciated!
Also no hole for LEMO 7-Pin jack. Sorry for the word salad as I am not on here often for discussion but hopefully this can kick off something cool.