In the slit trenches/fire pits,bunker,etc yes.The conecting trenches(I'd call it a comm's trench but there made to be used in there own right as well) I'll say no for now as without checking how the detail would restrict base movement .You couldn't push a 30mm base along the inside,without getting stuck on the uprights.As for the Fwd.O.P/C.P. No, its designed for 25mm base widths with roughly a 3mm gap.
I've tried to give a 30mm plus gap in each feature how ever this one just look wrong with that bigger gap.It my sound odd but its how it works best.