Hi Kilo60,
if you have the scenario till now, you normally can export the map as a map package.
1. Open SCE-editor
2. go to file menu
3. click on 'save as map-package' (5th point)
in the following dialog you can choose the scenario file with your map.
I thought this could help and save a lot of double working on the map.
greetings
LoneWolf