I figure if we're debating this much about the shins, then it probably doesn't make a visual difference, so I vote for just assembling them in a way that fits. For me, this is what Christine recommends - the long sides on the outside. TBH, though, looking at my shins, I feel as if the WTF shins are made up of mixed up pieces - although the right shin fits me much better with the longer side on the outside, I also feel the shape of that longer piece (with the curve higher up) makes it looks like a left inside shin.
Here's a pic of my shins to illustrate. I've now trimmed the longer sides but they are on the outside.