I've seen a few RSCs & altho the top of the recumbent is often flatter than that, but by no means always - a few quick examples:

Esslie the Greater http://www.themodernantiquarian.com/site/2466 (looks like it's been cared for better or even restored since I was there!)
Dunnydeer http://www.themodernantiquarian.com/post/36038
Berrybrae http://www.themodernantiquarian.com/site/2850
Kirkton of Bourtie http://www.themodernantiquarian.com/site/2638

Haveta say that these quick examples're mostly fairly knocked about ones or restored ones, but that might be coincidence. There is tho, the factor that one of the theories is that the profile of the top edge of (some) recumbents echoes the profile of some significant horizon hills. In which case, the 'flatness' WOULD vary and they'd often be far from level....

I think my only real criticism other than that the stones look new (!???) would be that its overall diameter looks a bit big for an RSC.

I must admit I often kinda quite like modern circles if they're vaguely authentic(ish).

Oh and btw, did you realise that Running Elk is Jason Schroeder - the builder of the circle http://www.themodernantiquarian.com/user/2723/weblog

love

Moth