I think that if you build two or more trenches next to eachother they should combine into a larger trench also trenches should be animated diff.... they look sloppy etc. a military trench is very organized.... also you should be able to rotate your buildings so they are angled the way you want them
the palisides should look like a wooden wall
they look to much like the trenches and i accidently click on the paliside or trench and not tell the diff