The project was created with plaster of Paris blocks cast in-house and glued together with simple white glue. Then undercoated and drybrushed. The structure has been used extensively in various demo games of Games Workshop's Lord of the Rings line
This topic is the elephant in the room in any cardboard crafting projects. Therefore I updated this classic article with new, detailed pictures to show you how this works in practice and what can you do about the problem
The best tool for paint stripping in my book is... brake fluid. The one used in cars. You can buy it at any gas station and at many run-of-the-mill supermarkets. It is designed not to damage metal car parts or plastic pipes but also to prevent corrosion and remove impurities.