Thank you lads. Unfortunately, since I used basic oil-based modeling clay, some repairs I made to the warped relief may not be permanent, and is, in other words, "fragile". I made an effort to seal the soft clay by applying several coats of crylon (with a few coats of acrylic paint on top) I hope that over time, the clay will dry out or harden little by little so I don't have to worry about damaging the maquette anymore. We'll see.