Hi SkyGunner,
As far as I know, you can make your models with whatever program you're comfortable with as long as you can export the model into .LWO or .LWS format in order to add the required hard points and also, this is the only format that the nexus converter understands.
Without meaning to sound daft, can you define what you want by ship creation tutorial? Once the model is made/converted, you just have to associate it with an entry into the tactictypes.ini and it's available for use.