Frames must be left largely unmodified. Frame shaving and clipping is largely banned, especially as it relates to the ducts. There are some instances where frame clipping or small modifications ARE allowed. Some of those instances include clipping ducts from any legal frame to use on your carbon fiber Fractal 75, modding your battery tray to better fit your batteries, or clipping the little tabs off of the back of the Meteor 75. This rule exists primarily to stop instances of the meta from devolving into excessive frame modifications that enhance performance, especially at the expense of durability or safety. One example of this might be to shave the ducts so thin that the drone is essentially "open prop." This isn't the kind of thing we want to encourage, and that's why this rule exists. If your frame modification isn't for weight savings (beyond clipping the little tabs on the back of the Meteor75) and it isn't for performance gains, it is probably okay. Feel free to reach out on the Underground Whoop League (UWL) Facebook group if you have questions and tag Isaac Pettit.