Martin,
The loco was built with frames slightly longer than the rest of the Royal Scot class, and when re-built in 1935 it was fitted with the Type 2 boiler. The Patriot, Royal Scot and Jubilee re-builds had the Type 2A boiler, because they were shorter. I think most of the problems with how it looks are down to the angle of the outside steam pipes, they just look wrong.
The nameplate is on the leading splasher, as that is where Fury's nameplate was.
However.....looking more closely at David's build, it does seem that the front of the firebox is forward of the centre line of the middle axle, where it should be above this line.
The use of a wide angle lens doesn't aid matters either....sorry David !
Ian