I think the game could us more tools for designing planes, and posting them with pictures/videos (on mobile). I think these tools would make a nice addition to the game

Corner Tool: Most of the fuselage blocks i made are always rectangles or circles, but no triangles or octagons. This would help with making stealth fighters, or tanks, or boats.

Canopy/Cockpit Tool: The default cockpits are not customizable, which isn't good. i think a canopy/cockpit tool would be great. it would work like the fuselage block, where you could edit many things like length, thickness, rise/run etc.

Spray/Camo Tool: This would be great for adding detail/camoflague without raising part count. it would work by the user uploading a PNG or JPEG file to a sub-assembly type menu labeled "DECORATIONS". Once the file is uploaded, the user can name/rename the image. to apply to an airplane, drag-and-drop the decoration you want onto the airplane, and resize it with the part options menu.

Photo Options (For use when uploading a design): while flying in the sandbox mode, in the editor, or in the pause mode, there should be a photo tool which let's mobile players like me upload exciting, cool ETC screenshots instead of the plane in the editor, because it does not look that cool.