This illustrate the main differences between Carrera and Scalextric/SCX systems.
1 big square on the grid = 1 feet
1 sub-square = 4 inches

You get a lot more options and lap length with Scalextric because of the tight R1 curves they offer. The smallest Carrera R1 curves have a larger radius than Scalextric R2, and the Carrera shoulders are almost twice as wide as Scalextric.
Before I fired up Track Power I was sure Carrera would be out of the question for such a shallow track, But now I'm not so sure anymore... I think the Carrera layout above came out pretty good, If I may say so :) it has some potential for some nice scenery. Take a look at Kellerkind's amazing "Targa Suburbia" with it's simple layout as inspiration:
http://www.slotforum.com/forums/index.p ... ntry779497Other advantages of the Carrera track is that it will let you run any scale without having to modify guide flags or pins, and you can run D143, D132 and D124 cars on the same system/controllers if you go Digital. There is space for at least 1 X-over and 1 curve LC in that layout, and possibly more with some modification. The larger radius curves will be also very flowing to race with the smaller cars.
On the other hand, there is almost twice the lap length in the Scalextric layout, and it's more technical, but then again "length" is not everything ;)