It's quite a challenge to use WPL C14 with 3S batteries but also to keep the original look.
I designed a new front compartment where you can fit either a ~1300 mAh 3S battery, or a 2S battery and literally everything else.
If you want to reach the front battery without disassembly you can use my hinge solution with the cut-out front hood ( https://www.thingiverse.com/thing:3925531 )
Update:
30/11/2019 - Added v2 version with doubled thickness (2mm) and optimized shape for printing (less support is needed).
front_cargo_v2.STL | 378.1KB |