I just started the helmet and its looking a little too big (note that i only have just the 1st 4pages clipped and glued) I'm 5'7 and my hat size is 7 1/8. could you recommend what the scale should be? I reprinted the helmet at Height 246mm Width at 210mm Depth at 273mm would that be a good size for me? I'm totally new to this so please bare with me.