i dont think i've ever heard of a computer not having a print screen button, unless its been broken off

i think there's a shortcut for it but im not to sure
anyway regarding the model, its rather basic in the sense that its constructed from primitives, cubes, circles and planes, my first recommendation is drop sketchup as fast as possible, its not very good for anything more than architecual modelling, and even in that respect it lacks a lot of necessary tools, i say download blender and follow a few tutorials, on youtube, on modelling within blender. learn the basics e.g. how to make, UV map and texture a box, once you've done that move onto proper modelling, if i were you i'd finish this model within sketchup and then move onto blender, it's a vastly superior program, in my opinion at least, good luck with the rest of the model