I agree, putting it all together and groundwork is my favorite part. The details and accents: different grass, placing broken wood amid rubble, put a bird's nest in a scratch built tree- I even forgot where it was until I stared at it for a minute.
My next big project will be a grand dio of a battle in an Oosterbeek street. It will feature my first (9) Brits being chased out of town by about a dozen or so Germans. I'm gonna go in reverse for the first time, meaning I will build the ground work first, then construct the figures to conform.