Hard to say, Christian has a daytime job so I m not willing to push him to a solid date. As you say, there is a lot of passion in this project so we rather get it right than get it fast.
At this moment we not far from completing all objects. After that we have these steps to completed:
Place all the 'standard' objects like ships, turbines, buoys. There are many thousands but this is to a large degree an automated process we got databases to guide that.
Create the places where installation is done. So where new turbines are being placed or new oil/gas wells are being drilled. Those really will be the highlights of the project. You will see the huge cranes, the huge support vessels, the crew boats, the emergency vessels etc. Often hundreds of people work on these things and they are really massive work sites.
Combine the files into an project and share that with our testers are partners (like the Global Shipping crew so they can avoid their ships sailing through wind parks etc)
Manuals, installers yada yada yada.
die Kennung alleine zu ändern ohne die Texturen zu bearbeiten geht, soweit ich weiß, nur bei ganz wenigen Flugzeugen. Die Thranda Kodiak um ein Beispiel zu nennen. Bei allen anderen Modellen wirst Du die Texturen bearbeiten müssen. Hier ist ein recht gut gemachtes Beispiel: http://www.x-plane.at/drupal/node/60.