Measure using a digital caliper and use a simple CAD program, I use Rhino myself. Cant really get any simpler, Rhino is super simple to use.
IMO there are no airsoft parts that require 3d scanners. 3d scanners would be useful for complex shapes such as car bodies and the like where measuring by hand is nearly impossible.
TM MP5k PDW -ris, stubby grip, DNTC, electro
KWA USP 45
"SNIPER" is NOT a gun. It is a person. Saying "I use a sniper" is like saying "I fly a pilot".