This is my trench table, though I didn't make it. I have to make some blockades to provide more LoS blocking things (or at least cover) and I want to make two more 2x2 sections of no man's land. Another idea I've had for more cover is to make a few pieces of wrecked vechicle terrain that fits into any crater of your choosing. There would have to be a couple general sizes since the craters aren't all uniform, but I feel like it could work.
Not quite as epic as the tables above, and in hindsight I wish we had have thought to make the trenches a bit more damaged. Still a joy to play on for sure!