This mod project is probably your best hope. Its for Entrenchment so it should be compatible. Hopefully it has what you want, or otherwise ask the creator, he's active.

If it has what you want, to get modded planets into the GalaxyForge, copy the GalaxySenarioDef file from the mod's GameInfo folder and paste it into your galaxy forge folder. The new planets won't have icons obviously but the game will load them just fine.

I'd like to see that as well.

I started making a map for our solar system in Galaxy Forge awhile back. I even used online resources to try and orient each planet in the spot of their orbit around the sun where they actually were at that same point in time, with a few minor changes to make phase lanes line up better. I got a good part of it done, but having all the moons appear as asteroids and such eventually made me decide to scrap it. Just didn't quite work with the limited selection of objects.

A true map will not work.

Unless you want typical terran planets the size of in-game asteroids.

Download Softimage|XSI Mod Tool and I can in a very short time teach you how to scale planets how you like and add moons and test in-game.

Another question: any of you guys know how to turn off militia on planets? Basically the map I'm making is supposed to be like the first time humans have branched out in to space, as well as the first contact with the Vasari (although this isn't in the SINS mythos at all, just an idea I had for a map). So, with it being the first time they have branched out to space extensively, there wouldn't be any other militia there. Any ideas?

Let me know when you have Softimage (Used to be called XSI Mod Tool and most just call it XSI).

Once XSI is in you start by creating a project directory. If you eventually want to use some scripts I made then follow what I did.

Made a new folder in C: called Developer. Developer is where I keep all my modding tools and reference files and the XSI project I called Sci-Fi_Project. Open XSI go to File --> Project Manager and make a new project. This project will install a bunch of folders, most important for you are Scenes and Pictures. 

	Download the Artist’s Guide to Softimage with 8 hours of video training lessons. These lessons do assume the user has some experience with modeling. (exe - 1.72Gb)

 The 1st couple tutorial videos will help a lot. 

Place the scene file below in the Scenes folder and place the textures in the Pictures folder. Get that far let me know. Textures will not be connected yet in the scene but I show you when you need it.

planet_earth.7z 

Binary planet model