This is not a tutorial per se. I think this:
http://www.davesgames.net/
plus this:
http://www.bestpapermodels.com/en/paper-models-scale-calculator/
and a little bit of this:
http://62.96.5.93/viewtopic.php?f=66&t=23274
may equal awesomeness! Hope to show you the results soon.