Yes - they are all 1:8 scale.

Rev - the Ferrari 643 that I just finished took about 10 months. I expect this 126C2 to take a little less time since I don't have to do any carbon fiber decal work (the body is formed out of real carbon fiber). Doing the second engine will add 2-3 months to the project.

The scratch-built 1932 Rolls-Royce that I completed before I started doing F1 cars required 1600 hours over two years. That was the longest build project I've ever worked on. On average, my projects usually run 10-12 months from start to finish.