I have a view of 103 on the weedspray train going up the WRC at Carrowmore, and the windscreen top line is definitely above that of the cabside windows. Same goes for the photos Des provides in the kit instructions.
It's much more noticeable if seen from platform level instead of ground level, but try this one. The whole optical issue is driving me nuts because Des's shell is essentially right in its proportions, and it's only the windscreen apertures which I think need extra work.
The perceived asymmetry at one end (one corner pillar is thicker than its opposite number, and one part of the divided buffer beam appears wider than the other) is also something that needs correcting - my problem is that once I've noticed it, it won't go away until I do something about it.
Yes, they do - it looks like something to do with the method of sealing.
Your photo of B108 also suggests that the outer edges of the marker light box fairings line up with the outer vertical edges of the windscreens.
There doesn't seem to have been any consistency as to fitting of windscreen wipers either - some are pictured with one, others have a pair.