You're in luck. Since you don't need any of the PCB stuff for PS/3, just remove that bottom board and pitch all of it. 
On the top board, remove the stack funnel, and just cut any traces leaving from the two resistor pads on each side. Remove all the wires. If you plan on using the existing headlight socket, it has to be totally floated, both wires, no frame connection.
If ou post a picture of the top of this board after you've removed the funnel, I'll indicate the traces to cut and what to jumper.
