If the game is worth anything (which it looks like it might) Stargate is a VERY expensive property to buy (which I know this is free so you do not have to worry about it). I have run into the same thing with another franchise. I thought of doing a game of my idea (based on another popular movie) but it is a lot of effort on my part for not being able to sell it.

I no longer want to sell a game but standing on the shoulders of an unattainable property is unrealistic (I see)

I am working on an existing property game now but it was not a deal where I had to spend money on the rights.

I guess what I am saying, is be careful putting a lot of effort into making a game you cannot get money for. Not for you as you are working for free but to others making games.

I hope you finish! Good start anyway.