This isn't the place for conflicts people.
Davin has already stated there are no stupid questions, but its been said many times before that this topic isn't worth even asking about. Even the tools to actively add new planets still aren't available to the public, never mind a simple one click conversion tool for NGE assets of this scale.
I'm not taking any sides, but Uli's point is perfectly valid. If this is something you want to do, you'll have to figure it out. Half of the fun in modding is figuring stuff out. Nothing of this scale is quick or easy. If anyone has figured it out they aren't going to make it easy for you, when they put the effort in to get somewhere with it.
People will be glad to give tips and hints when you're trying to do something, but you wont find a dummy guide for something this big anytime soon.
P.S - Personally I don't think the expansion planets are even worth adding, may as well just grab the artwork and start from scratch, they suck.