I have the same glider as yours, it is made in China, about $40 here, some points you should pay attentation:
1. Re-glue the tailboom and the pod,
2. modify the tip wing panel, you should increase the angle between the tip panel and the center pannel, otherwise it is difficult to turn.
3. Add gusset between vertical tail and horizontal tail, and add some more epoxy between horizontal tail and tail boom.
4. Add washout