I had a TG-3 - my first RC plane. It too took a beating while I tried to learn to fly. The foam is mostly there to define shape and take comression loads. First remove the covering and tape all around the broken areas. Then you can spray the broken ends with 3m77, carefully stick them back together. Next retape and cover. The tape and glue will hold the works together. It won't even be any uglier than it was when it was new.