Did the roof get wider or did the sign box get shorter on 2010+ boxes?
I'm following the 2005 TARDIS Plans: https://www.dropbox.com/s/bkbkaameov9rwh7/2005TARDISPlans.pdf?

On the above plans, the sign box is 50" wide and the first layer of roof is 49" wide with the 2 additional bits on either side sticking out by 1/2" each meaning that is also 50".
This should mean that they line up perfectly on the box, which they do, as you can see on the pictures below.

http://www.bbc.co.uk/doctorwho/gallery/s2_10gallery/1024/tardis.jpg
http://img2.wikia.nocookie.net/__cb20120608010026/tardis/images/b/bb/Empty_tardis.jpg
http://2.bp.blogspot.com/-zNkwfJeRLNM/UpDmbhTZj1I/AAAAAAABGhg/VGoVmWGwJ-w/s1248/TARDIS.jpg

However, on 2010+ I have noticed that they no longer line up, meaning the roof either got wider or the sign box got shorter.
I'm having trouble determining which it is, thus the reason for this topic. Here are some pictures showing that they don't line up:

http://i.snag.gy/43e4R.jpg
http://www.contactmusic.com/pics/lf/doctor_who_161012/matt-smith-the-cast-of-doctor-who_4128727.jpg
http://1.bp.blogspot.com/-38irUCKTBtg/UEp_jm46MjI/AAAAAAAAFEw/3l4YcO-0Mgk/s1600/new-tardis-look-s51.jpg

Sorry for lack of pictures as most are at an angle, but I'm sure you can tell that it doesn't line up based on how the sign box lines up with the roof at whatever angle.
Adding on to this, was wondering if anyone had any straight pictures (as in not taken at an angle) of any TARDIS 2010 onwards so that I can determine how wide my roof should be?

If I'm seeing things and it is infact the same size feel free to let me know
Thanks

I'm going to say the roof is wider since the corner posts are wider too.  If you notice, the edges of the first tier land right in the center of the corner posts.
Bill "the Doctor" Rudloff
P.S. Thanks for taking up the mantle of figuring out the 2010+ boxes.   I've not had the time to do it myself.

Ah yes, I see it now, thanks.
My roof looks much better now, added an inch to either side.