Unlike that first slot, the remaining T-slots will be too deeply recessed to reach with fingers. Instead, we’ll use masking tape to temporarily hold each nut in place, then remove it later.
Try to get the nuts roughly centered-ish in the slots.
Do the same for the two slots near the top of the screen.
Hey! That wasn’t so hard. Wait for it…
Start to place other elements vaguely in position: Pi near the bottom, buttons near the front.
If you find your wires getting tangly again, it’s okay to disconnect and re-route them.
Notches along the top edge of the button support should align with tabs on the screen bezel. If not, your button piece was assembled upside-down. Remove the quick-connects, unscrew the buttons, turn the piece over and reassemble.
The screws don’t need to be tight…in fact a little “give” is helpful at this stage. They just need to catch the nuts that are taped in place.
Some of the acrylic parts will fight a bit and not fit into their slots. Poke a small screwdriver through the hole and try to nudge these parts the right way.
If this is a dexterity challenge or you have smaller hands: rather than installing screws from below, remove the masking tape from the prior step and try fitting the side into place from above. Once the screws catch, you can turn it over and proceed through the same steps (just reversing right and left). Another approach is to scoot the whole assemblage off the edge of the table just enough to reach the screw holes from below (one at a time).
A fourth screw holds the Raspberry Pi base. You’ll need to stand this base piece up and fit it into the slots at the bottom edge of the side piece.
You can now remove the tape from a couple steps prior. Keep the other tape (holding nuts) in place for now.
The plastic piece holding the credit and start buttons should be hanging out the front of the case at this point. If not, move it there. It does not need to be fit into the notches yet, we’ll do that later.
Make sure all four nuts are still held in with tape. If any have fallen out, press them back into place.
Get the tabs and hole aligned for this one part, then insert a screw. Do not crank it down…a loose fit is fine, just so it has a good hold on the screw.
You may need to nudge each piece into position using the tip of the screwdriver through the slots, or with a finger from behind (when it can fit).
You can now remove the tape that was holding the nuts in place. Some of these will be deeply recessed; you might need tweezers to reach them. If you can’t reach them, just leave them be…nobody will see them and they don’t interfere with the system.
Now gather up the other four case parts…
The case blocks access to the Ethernet port; WiFi is the only networking option.
Without WiFi, you can still load games into the system by inserting the SD card into a USB reader on your computer and moving ROM files to the /boot/advmame/rom folder.