Hey Dave, try uploading it to a site like imgur.com then posting a link here! If possible, starting up a build thread with specific questions, your progress, etc will go a long way to keeping focused and hands on discussion Something in this section here:
https://www.whitearmor.net/forum/forum/80-anh-build-threads/
The SDS armor has some drawbacks to it in terms of accuracy, and some stuff (such as the mentioned ear bumps for a hero variant) may need to be adjusted for Centurion level stuff, but you should have no problems getting it to a 501st approvable level if built correctly.
I'd also suggest you reach out to your local garrison as a recruit and let them know you're working on a Stormtrooper. Often there are build parties where you can get hands on help and ask questions; you may even have a local attache to give Stormtrooper specific knowledge in depth