I completed the Third Installment of Simulation R. I've realized to make a good game there should be a lot of legwork. The most important point is to include the most modules. Blizzard did this with the Galaxy Editor.

There are around 10 major modules, the most important being Terrain, Triggers, and Data.

Players can develop Modules also. In fact many Mods are available to download, and Blizzard has included a number of built-in Modules in the library.

Video: #Three

Video: #Two

Video: #One

I think the best technique is to meditate which syncs up your Modules as you build them. There are no known timing issues with this approach.