Nice area! What scale are you going to be? You could put G in there and still have room.A rough sketch of my monstrosity. 30x30 foot square basement. My bad wrong sketch, can't find original.
http://www.modeltrainforum.com/attachment.php?attachmentid=253017&stc=1&thumb=1&d=1483104596This is my layout. It's a shelf on a coffee table