Two images to make up for my lack of posting. I've continued to work on and improve the replica editor (I have to use that term becaues Model is already taken by XNA). It is just about complete, all that's left is selecting the child face for adding replica parts to another replica. A few hours of work at most. I've spent some time improving the usability since I'm going to be in there adding a lot of content soon.
I've also firmed up the "script" system so that I can build levels and scripts. I've tried to keep it as simple as possible. Scripts are composed of list actions with a time stamp that are triggered by events. So you can easily say, when the player enters this region I want to spawn a ship and have a dialog box 5 seconds latter that says, "I'm coming to get you." I added the time stamping to actions because I figured if I didn't I've be making a ton of events taht just corrseponded to time delays. This way events can be just for this where you don't know when of if they will happen (hitting a trigger volume for example). Should keep the scripting simpler.
Here's one of first things that you see during the tutorial.