I go to the company site , like Komatsu, then look up the machine you want to build. In the broucher area it will have a drawing with sizes in feet and inches. I then go to a scale calculator and convert it to 1/14 scale and in inches. You now have a side view and the size in inches. Print photo's of the machine from the internet and away you go...
Machine ;
http://www.komatsuamerica.com/viewch...id=999&chart=2
Scale :
http://www.komatsuamerica.com/viewch...id=999&chart=2
greg