Jim--
I'm at the same point--and also have been shying away from the floor to ceiling versions because I want to be able to open the garage door--especially since my wings will be built during the summer months.
The best and simplest solution so far I have found is Will's at
http://wills-rv9a.com/My_Homepage_Files/Page6.html. He's got a couple pictures of different varieties, including the free-standing varieties, in the wing section of his website, plus the double-wing version that he built that is also free standing. I haven't heard how it's working, but he seems to be making good progress on his wings using it.
Mike Schipper also gave me a good pointer if you are building both wings at the same time. He originally spaced his 36" apart, but recommened that another 6" be added between them to give just a little more working room.
I don't think the wing jig is as critical for the -9 as some other varieties (so your mileage may or may not vary given that you're building a 7). When I was at Vans, Gus said the -9 wings can just be built on a flat table top if you want--the prepunching will make sure it comes out straight. That said, the wing jig still allows for better access and so I think something along the lines of Will's will be what I go with. My wing kit ships May 15-ish, so I kind of need to get going on something.
Good luck.
Steve