When reassembling any of the three expansion port bays, make sure that the lower "lip" fits BETWEEN the PCB and shielding underneath. Failure to do so may not allow the Rear, Top and Front outer panels to close properly.

When putting in the motherboard back, insert it the opposite way you took it out. Slide in the PCB bottom side first, then flex up the top frame area while pushing down the topside of the PCB.

After reinserting the motherboard, check to make sure that all three three expansion port pieces are snapped correctly into place within the bare PC-FX plastic frame.

Again, remember that when reassembling the unit, you will need to affix the panels in the exact reverse order you removed them in this guide. (Rear, Top, then Front). This is because they are interlocking.