OK, the trenches are at a point where they'll do. They were never going to be anything other than gaming pieces; high quality trench modelling would require cutting to a base board.
I'd like to add at least another T-junction piece and probably another mortar position. I'd also like to get some Milliput and add some sandbags to the roof of the dugout.
I might also add a bit of static grass around the edges to give it that long-established look.