Sounds like fast track. Make SURE everyone understands this, so that you aren't hit with change orders later. When you add work in multiple packages, you are not correcting deficiencies from the previous issue, but a lot of contractors see it that way.
Example: If you don't know what the exterior looks like yet, you might discover you need embeds long after the structure has gone out. Contractors love to get you into that situation! Revit can't help you there.