Packing 25 N pentacubes in a 5x5x5 box
25 N pentacubes can be packed into a 5x5x5 box in only 4 different ways without considering symmetric solutions.
The process to assemble one of these solutions is displayed in the following pictures.
The python code Npentacubes.py takes about 1h to find all the 4x48 solutions (including symmetric solutions).