Help fill holes in Trunk lid

so what we have so far is weld it, pop rivet it,bond it with glue, fiberglass or just fill it with bondo. If it was mine I would weld it, if I knew I was gonna get rid of it in 3 years I would glue it. If I wanted to sell it soon and wanted it to last at least till the guy forgot where he got it from, I would pop rivet it. Fiberglass or bondo it up ? sorry I can't do that god would never forgive me