Is it possible to 3D print a front bumper grille for a Honda Accord CL7?
Your best bet for the material would be one of the high temperature filaments like the ColorFabb HT ones, they can take quite a punch when it comes to heat.

As for the model, you could try to source one of the grills that is at least as good in shape as possible and get it scanned, there are people offering this as a service for example over at 3dhubs.com

Glue is really depending on the part, I would suggest creating a click-together type of system so the "glue" is only stabilizing it and not beeing a structural component. You can also get hold of a 3D Pen and weld the parts together with the same material used to print.