I went to Balzer Elektronic to get some pieces. Only got the 15-way IDC, a fan, and some microswitches.
The microswitches are the wrong size.
Fastened the fan in the fan holder, no problem.
The IDC is correct, but the ribbon cable I have is a very colorful one that apparently is just meant to be a supply of single cables. It is just a little bit off the size of a regular ribbon cable. Good thing I noticed before I squeezed the IDC.
Also, I found my Melzi.