This is the jig I use to hold the parts of my hinges in alignment while the glue dries. It is basically a model of the rear of one of my boxes with the back and lid in one piece.
It’s important the hinge is accurately aligned or the lid movement may be stiff when the box is assembled.
I use lots of spring clamps — they’re cheap on eBay and very versatile. I have padded the jaws of some with 1mm foam. The foam is stuck with double sided tape. It protects the edges of curved parts.