My first thought was a Ferrari body. None of my shelf cars have a Ferrari body. They're seemingly getting rare, especially the LaFerrari.
I dig the side mounted motor too; it reminds me of the old TA02. It doesn't matter to me if it's the best performing car as it will never be raced.
I wonder, since the regular TB04 could be built with IFS, if the R comes with the parts to build it that way too. I love the way IFS looks, and it'd help if I do find a nice Ferrari body to not have to clear the front shock tower!