02-20-2008, 09:17 PM
Gerard... 20guage is 0.9mm, however if you are making this yourself. I would suggest that when you come to make the plates, try hammering them into shape. The girdle plates in particular, for this gives you what is known as Stressed metal and gives 20guage as much strength as 18guage. Then again it is not as heavy as 18, however being stressed metal it can even be stronger than 18.
Brian Stobbs