With this little jig, you can bend wire to many shapes. The size of the pegs (or machine screws or whatever you want to use in the holes) depends on the size to which you scale the model. The one in the photos is 101mm L x 24mm W x 20mm H and the peg holes are 5.75mm.

This is my first design, so I'm sure it's not perfect, but it worked really well for bending wire for fishing tackle.