http://www.newegg.com/Product/ProductList.aspx?N=100007583 600006305&IsNodeId=1&Submit=ENE
Looks like you should just get a normal size ATX mobo. I'm not sure how you're gonna fit the water cooler in there with the other stuff. Go full tower!
Its from /r/starcitizen and a pic someone took of it there. I'd say if they are willing to show it then this is fairly close to being done or this IS done and they are getting other assets together before a sale in the near future. Probably Citizencon.