Yes, I can see why that might be confusing. The pictures on Mike's site all show the old 1.0.5 version.
If you download the latest version, 1.2.1 you'll find this instead:
All you need to do is to calc the true dimensions from LDView
[attachment=1645]
x = 290+270 = 560
y = 256+24 = 280
z = 10.214+38 = 48.214
Your model is 28 x 2.4 studs wide and 11.6667 bricks high
If you download the latest version, 1.2.1 you'll find this instead:
All you need to do is to calc the true dimensions from LDView
[attachment=1645]
x = 290+270 = 560
y = 256+24 = 280
z = 10.214+38 = 48.214
Your model is 28 x 2.4 studs wide and 11.6667 bricks high