Jules you did very well on guessing the builds on the shelf. You missed three.
On the top shelf from left to right is an old 1:48 P-40B in AVG markings. An old 1:72 Sabre in RCAF colours, the little one you thought was a Fokker DVII is actually an old 1:72 Spad XIII. Then yes you are right an old 1:72 Ju188 (I had to fix it up when I pulled it out of it's box - it was missing the port landing gear and both wheels) and then the 1:72 Beaufighter TF.X from this Canadian GB.
On the bottom (LtoR) is my 1:48 A6M2b Zero from the PH GB, then the one with two blades is the 1:48 Ki-43I Hayabusa I just finished before Christmas for the Japanese AC GB. Then the one you thought was a Spitfire is actually it's arch enemy an old 1:48 BF-109G! (I know the picture wasn't great so I'll let it slide). Then my 1:48 Hurricane from the BoB GB and then lastly my 1:48 Typhoon I also finished during the BoB GB last year. And yes the big black one on the desk is a P-61 Blackwidow but was so trashed from being boxed up for a long time that it is my new paint hulk!
I have another shelf with four other old models on it (1:48 Hellcat, Avenger, P-51B and partially finished Devastator-missing decals and rear gunner). When I say old I mean I built them between the ages of 10 and 18 (ei: 12 or more years ago! and not very good). I also have 10 or so packed away in boxes (Mig31, CF-18, F-14, one of the first stealth fighter models, a Mil-24 Hind Helicopter, a Huey UH-1H, and another crappy P-51D where I ripped off the landing gear, just to name a few).
At one point I also remember I had about 20 other models but between selling them at a garage sale, giving them to friends and fire crackers/pellet guns, they are gone. I had an F-105 (built in one day!), CF-104, CF-101 Voodoo, P-47D, P-38, Spitfire, Ju-87 Stuka and USS New Jersey are some I remember with fondness... ahh the good ol' days... sniffff...
As for running out of room, as I build more "new" models, I'll be putting away the worst of my older ones into storage. So I think I have enought space for about 10 more new builds.
Sorry for rambling on like this, I hope I didn't bore you.