Think I'll chime in here real quick on the topical vs layered topic.
Yes, we know that the real screen used helmet had both tchinques. However, from my recent research, I am under the impression that the real deal was mostly topical. SO...IMO it comes down to what you are going to be doing with your bucket & how accurate do you wanna be.
Topical is great, BUT...In my experience, a layered job looks way more realistic in person if you are close up & oogling over a persons costume!!! (remeber, when the original was painted it was intened for screen use) On screen or in pics, a topical job looks killer, and if you are a master painer like Spidey, DM, or FP, then you can match the original scratch for scratch. BUT, for many of us, (myself included,) its tough to make a layered job look realistic looking when viewed in person, Many topical jobs I've seen have a dabbed on look. (No offence meant guys...I'm pretty shure the real one looks like that in person too!!

)
So really, something everybody should consider when painting their new buckets, is how are you gonna use it???? If you are an active 501st'er & have tons of people getting in your face for pics etc, you may wanna lean towards layered for realisms sake. If you are a an accuracy freak & wanna get as close to orignal as possible, you might wanna lean more towards topical. Either way is fine IMO. I really haven't decided which way I'll do my next bucket. In a perfect world, it would be nice to have two helmets...one really accurate topical for the display, and one real looking layered for troopin. but that aint gonna hapen for me.
Sorry to veer away from the thread topic Spidey. Again, superb looking bucket!!!!!
D