Everything you saw in the video presentation or screenshots is in the scene, it's a great first that gave us a huge job. But in two to three clicks, you now have a thousand items. Your only concern will be to position exactly as shown.
Unfortunately Dunkirk is not textured on the map of DCS, it is necessary to find beaches with a height difference of 0 to 3 meters, and there are some.
But we put a typical mission,named (DUNKERQUE 000) you can launch it directly from 'Missions'. before editing. In any case, it's very simple, if you're a little used to the mission editor.