Can anyone see where I've gone wrong?

I'm going through the weldment sample exam and on question two I've to create a 3D sketch and then measure the total length. When I exclude the construction lines my measurement is 13912.59 but the correct answer is 13924.58. I'm close but can't see what's wrong with it to give me the different measurment.

Has anyone any ideas?

See attached my sketch and the sample exam paper

SolidworksWeldments