Definitely from the top and as per the picture you csn use painters tap to trace out the correct curve and use this as a guide when trimming. But as with all trimming best to start off small and take off more as you go. Sent from my SM-G960F using Tapatalk
Welcome the the FISD Rob, definitely a great idea to reach out to the local garrison and start a build thread here on the forums so you can get any help/guidance you may need during your build.
Best of luck future Trooper.