Hi @Umar Kamal the fender lining can be replaced as that is fabric. Regarding the underbody, you would need to get a skid plate 6 or 8 mm thick. Also, depending on which variant of the JGC you have, you can remove the lower fascia, front and back to give you a bit more approach and departure angle.
We do have quite a few JGC joining now so would also appreciate if you can start a new thread with your queries so others can also chip in and we have 1 thread as a reference for all JGC owners.
THe 2 pics below are of the front and back without the lower fascia and the skid plate.