When I uploaded the STL files to the Files section for the first time I forgot one piece. Now I have named the STL files with letters consecutively. I have also included an image showing each piece and its corresponding letter. Nut I and K are not the same, although they look the same externally, keep this in mind!
The L part does not necessarily have to be 3D printed. I have found it feasible to cut it with a laser cutter or a CNC. I have included the DXF file of this piece.

Part G can be replaced by a standard tube of that size and would avoid the need to print it.