Engineering MBP, which size?

<p>I'll be attending LSU next fall as a PetE major, and I know that as LSU is a large school, some of my classes will be held in a large auditorium-style setting. I want a retina MacBook Pro when I go to LSU, but I don't know which to pick. Will I be running programs such as AutoCAD on my laptop? Is a 15" notebook too big for the fold-out desktops in LSU lecture halls?</p>

<p>Anyone please?</p>