Another thing I'd like to find out is how many screws are used on the top side. The top corners are obvious, but the rest is hidden by trim. On mine, the trim is currently removed but the ribbon windscreen seal still blocks most the view. I can see most of those slotted tabs are unused, but not if there's a screw just out of sight or perhaps a hole under but not in use when should be. I need to check a few pics where guys are replacing trunk rods, I've said that before. Or check my other manuals since the main ones didn't show this area in detail. Or just remove mine for a look, but rarely spent much time near it, stored elsewhere.
Had a quick look, by sticking head up under the sides you can see where all 3 locations in the centre on the topside have a scalloped pressing, same as below. So that it was once intended to have a screw option, and if so the screw hole wouldn't go beyond the second skin on the trunk. That still doesn't tell if there is actually a screw there, pretty sure it'd be visible if it were there, but moreso if there is a hole there or not. I can see basically the entire area of the slotted part of the panel and no screws, but leading edge has sealant. If anything there at all, it would barely be touching the panel edge. But it is capable of using one if ever needed. Took a few blurry pics, kinda off topic but was also just for sake of conversation anyway. I'm rambling a lot, I also edit and add extra info and it doesn't always make sense or read easily.