I would advise if you want to do Bin Packing to either use Miscellanyor Rhino.Inside with the grasshopper one you mentioned, (especially if you are familiar with it).
Playing around with Miscellany, I managed to do this with very little effort:
@jacob.small, I would also keep an eye on the branches for packages being developed as it appears Miscellany has had more recent updates (2019-01-18).
