Enter Revit Skyscraper Open House Project
After joining and logging in, access the downloads section, download the ZIP file and run the EXE. You should be greeted with something like this as the Citrix hosted solution starts up:
Once you have joined and have access to Revit Skyscraper, please feel free to comment below and I can add you to a Sandbox Project I have set up, and also add you as a contact for chat. Have fun!
I recommend you join the project and read some of the early forum posts, particularly if you pondering issues of IP, who owns the model, permissions and the like.