hi.. this easy tutorial for set blueprint in Rhino
i hope like this :
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1- start :
create a box with coordinate same as set blueprint
for example in this blueprint :
length : 768 px
width : 304 px
height : 288 px

download : Citroen 2cv

2.jpg
...........

2- set view
first , turn on END snap

5.jpg

now right click on name of view (top - front -left or right ) and select current blueprint to set view same as this image :

3.jpg

3- now...drag mouse on box (when turn on END snap) and set blueprint in view
you can hide this box and press F7 for hide grid

4.jpg

this way to set blueprint , is easiest way and Convenient to work with Rhino
good luck

sorry for my bad English