Difficult Puzzle

This is a puzzle cube I designed years ago out of wood blocks but cant solve now. I drew it in autodesk hoping someone could do it. Please post pictures if you figure it out.

"Body13.stl" needs supports but the rest don't if oriented the right way.
It should form a 4x4 cube if assembled correctly..


August 2023 update: TerseMosquito solved it! See their comment for assembly.