ものすごい華奢な作りで「そりゃ壊れるわなあ」と思いました。
調べてみたらこの機種はヒンジの取り付け部が特にもろいみたいで、同じ壊れ方してる事例がいろいろありました。

というわけで、外れてるネジの金具をプラリペアで固定し直してヒンジ部分の補修は完了です。

It was incredibly delicate construction, so I thought, "Well, of course it'd break." I looked into it, and it seems the mountings for the hinges on that model are particularly fragile, and there were a variety of examples of them breaking in the same way.

So, with that being the case, I resecured the fittings for the removed screws with Plarepair and finished repairing the hinge sections.