Well, I'm excited.
As was foretold, I got a rotary tool for Christmas, and I'm very happy because it means that I get to start my helmet!
I ended up using both 5-gallon buckets, since I'm doing all my cheek stuff and earcap nonsense in the flexible bucket plastic instead of sintra. After cracking my shoulder plate, I trust the 3-mil about as far as I can bend it, which is not far at all... I've been covered in black dust all day, even after making a little cardboard booth in my room to corral the shavings. I've cut all the major pieces so far and sanded two:

Here's how the cheekbone/brow ridge/visor overlay looks right now. The cuts are jagged, so I've given myself a sharpie's-width of leeway to sand smooth after cutting. The plastic is very flexible and I was kinda concerned about how the final product would hold up... But after I got the main body pieces together and taped to the dome, it turns out the thing is pretty solid.

(Pardon the bad pics; I was rushing...) The upper area is marked for rivet holes, but I'll end up adding more underneath where the earcaps will go to keep that side seam together.

If you look at the back, you'll notice that it doesn't have a seam at all - instead of one in the back, I split the main body piece into front and back and will hide the two gaps under the overlay piece. I did this because 1) I think it'll make the whole thing keep it's shape better and 2) I'm really, really lazy, and honestly don't wanna bondo a back seam and then slap a keyhole panel in there later. I'd rather just... cut the vents and call it a day.
Anyway - After I drill and set the rivets I have (little autobody ones my dad has provided) I'll maybe do some sanding and then glue the overlay piece on top...
What glues do you all use? I have some E-6000 that I was hoping would work, after I rough up both surfaces some.
Also speaking of roughing; it turns out those $1 little nail buffers have some pretty good sandpaper on them and are easy to work with. After grinding the fresh-cut edges with my dremel, I'm going over them with a couple different grits of nail-buffer-paper, and it removes the burrs and shavings and smooths it out. I don't really trust my dremel quite yet, and using the sanding drum leaves a wobbly edge on my plastic. I'm... still getting the hang of it... Cuts great, though!
More progress... hopefully soon!
- Thel