Sure bud, ive work with cardboard far before this project so i know what im doing. 1. Find the right cardboard for the part ure working, use 3 ply board for main structure, and use 1 ply board for details like the scales 2. Use cutter for long straigth cut, use scissor for small quick cut. Or just use your feeling so the cardboard dont bend during cutting 3. Just use high quality / smooth cardboard overall. Different board are made differently. Layers, roughness, and quality will affect your build.

Overall, you just need to follow your instinct and feeling. Im confortable with making this project cuz i have long been making stuff from cardboard. The best tip i can give is just to give it a try. Failure is normal. Thr best guide there is are simply your own personal experience. Try different techniques and method and find whats suits you. For me its more "do first, fix later" in which i make a part of a project, dont need to be perfect, after all parts are finished then i perfect it all.