i thought i would add one more thing to this thread for those who want to learn how make there own ported boxes.
the program i use to to draw my boxes is called sketchup 5. the progam it self is not cheap.but sketch up teamed up will google and released googlesketchup bata.the best part is its free. it is not as good as sketchup 5 but its free.
http://sketchup.google.com/
heres a few tips.
window,model info,units.
change format to decimal and precision to 0.00
window,prefrances,template
change it to no template.
watch/read the tutorials. enjoy..