Well, I started to read and wanted to comment but my memory sucks so please forgive me if I forget names.
The race track: EXCELLENT. At first I thought it was strictly for drag races but then I saw the track did actually make a loop. Well done. What size lot is it on? I'd like to see one on a huge lot to give that "Daytona" appeal to it, or Grand Prix.
Zap, I love the colors but I think you need something to add a very small spark in your rooms. Just a touch of a different, brighter color. And I do mean small. Like, colors on a picture frame or such. Otherwise it's a good build for both you and Lynley. A bit stark and too modern for my personal taste, (I tend toward traditional), but well done nonetheless.
Nore: Your opera house does not feel like an opera house to me, but more a home with side touches of opera house. Why would you have bedrooms and such in an opera house? Ok, in the premier dressing rooms, but otherwise no. I highly doubt a diva is going to be taking a shower, (and therefor messing up her coiffure), at the opera. Maybe after, but even that is debatable. I particularly find the roof confusing. All those statues around the edges and then that visually confusing clump at the top or the dome give it a feeling of not being able to decide if it is a mosque or a cathedral. I also find the white a bit too bright. Maybe a very pale grey? VERY pale, but just enough to tone down the shock of the white against the blue. Or, if not grey, then a cream color? What are those blocks between the seating for? They look uncomfortable and take away from the look of a gallery of seats. Did I notice an orchestra pit? Wasn't too sure. In front of the stage, which felt a bit small/short to me. Not too fond of the huge sculptures in the arches either. Something smaller on pedestals maybe? Or something more "open" looking? I don't much like the hay bale in the scenery either. Fire hazard!
A couple of single blocks of hay would maybe work? They would really be foam in a theatre painted to look like hay, with maybe a bit of hay glued on but I doubt you'd see big, round stacks.
I LOVE the balconies! I'd put a few more chairs and maybe go with a deep burgundy red velvet look for the seats and curtains though. Like at La Scala. Or go with a blue velvet. Your path into the building is meant to be marble, but unfortunately the marble terrain paint just doesn't look quite right to me whenever and wherever I've seen it. Too flat looking and more like dirt than marble. Maybe replace with the marble pavings? There are some very pretty ones and I know with your decorative flair you could do an awesome job with those. Have you considered putting in a basement for storage of props and sets? It would free up that area where you now have sets, which is a little distracting, and it would give it a very authentic feel. You could even have a room where costumes are worked on, a make up station and such. It's is quite a massive project and I applaud you for doing it!
Agneza: I love your new house. The colors and patterns are perfect, as usual. The little added backporch was just what it needed. Not a fairy tale house, but just as charming as one. I love the blend of the contemporary and traditional along with a bit of whimsical. (Whimsical is the cute additions to the yard!)
I didn't even mention the dance club or library! AMAZING! I so want to see that world you are building when you are done! I love the dance club. I never would have thought you could make it so functional yet be a smaller building. Everything I do tends to be huge, and yet awfully crowded. You take smaller spaces, fill them, yet make them flow and feel open and welcoming.