Adding bunkers and other improved fighting positions to your trenches can greatly improve the look of them!
A plain trench is great for infantry, but you can’t really fit anything bigger into it. If you want your defensive positions to include anything larger, you will need to make specially prepared positions for them. Making gun positions and improved fighting positions is a fairly straightforward process. The same materials used to make trenches were used, just in greater amounts.
The machine gun bunkers with overhead cover were made by reinforcing the trench walls with sandbags and piling them up higher than the trench to form firing ports. The roof was left as a separate piece so that miniatures could be easily placed inside of them.