After generating an OOB, click the "OOB Completed" button to load it into the editor.
I wrote this originally for TC2M, and for now it is the same thing. After generating a TC2M OOB it converts it to a SOWGB oob using the converter. Then you can load it into the editor right away.
Eventually I might rewrite it for SOWGB, but this works well enough, and it only took an hour to add it to the editor. (It took two days to write the original).