Harb, I don't suppose the Homeworld ships are still compatible? The installation instructions don't seem to make sense. There are no folders to merge to when extracting the .zip files to the SE directory, and even if I try to manually look for what I think is the right place, the folder name might not be exactly the same, or consist of the same structure. Currently I can see the list of ships in SE, but I don't see the actual ship when built. Just a marker at an invisible point. This is if I don't put it in the add-ons folder. Following the instructions in your original post and putting it in the add-ons folder, I don't even see the ship list. I've tried adding the model and texture folders as is to the add-ons folder, as well as trying to add only the contents of the add-ons folder in your files to the one in SE's folder.
...Wow, that sounds like a mouthful if you read it out loud!
On another note, how did you actually take the data from the game and put it into SE? Perhaps I can do a few myself. Want to see if I can get some of the ships from the Complex mod to work with SE.