Welcome, No, you can only replace the ships, you can not open up new slots for adding them. REbEd, is our tool to change the stats and the pics of the different units, ships, troops, characters, etc... Doanlowad it and toy with it, you might want to download cards for the models you downloaded, cards are files that include teh pictures and stats that can be loaded with RebEd. Look for Mask's tutorial, it is very detailed and it is easy to change models with it.