So couple of things. We really need to see the armor on your person to get a good idea of the sizing, and shape of the plates.
Additional your helmet doesn't really fit the appearance of a Modern/Legacy Era helmet and while it clearly pulls from the Pre Vizsla helmet the issue with that helmet is that it itself is already borderline when compared to other Helmets of the Modern era. So giving it the Neo-Crusader style visor and the raised fore and back bock ridges like that really push the helmet out of the range of Modern era and into Crusader. Additional the helmet itself is in need of some sanding the surface of the helmet is currently too rough to be approvable.
Now with all that being said, there is some light at the end of the tunnel and you have some options. You could either:
1) -Sand the surface of the helmet smooth and make a new set of plates to be in keeping with the Crusader era armor style and design. This would be the most work but if you are really attached to this helmet design it would allow you to use said helmet once its surface was sanded smooth
2)- The other way to go with things would be to shelf this bucket and look into either making a more standard modern era bucket or picking one up via the supply depot. Which can be found here:
http://mandalorianmercs.org/forum/index.php?board=270.0 The generally school of thought is that it is always best to buy your frist bucket as the amount of sanding required amount all of the other issues with a sratch build helmet make it a very costly and difficult earlier project.
Whatever you decide, we are here to help you through the process.