Update after two years!
So after experimenting with different ways of making the bowl, I finally managed to get it right using a single piece of steel and shaping it into a dish using a dished out log that I made and smoothing it out with the cheap English wheel I bought on ebay. I abandoned the two helm halves method as I couldn't get it to look good with the weld seam (how did goldpointprops hide the welds so well?!) I then had to weld a band around the edge of the bowl to give it more depth. Welds came out alright there, should be invisible when the helmet is painted. I bought a nylon bossing mallet for shaping the dome which really helped as its much lighter to swing than a steel/leather mallet and much easier on your hands.
For the faceplate and backplate I used thewizardoflight's templates but had to add about half an inch to the length and height to match my Hasbro black series Boba helmet which I am using as a template, this helps me get an idea of the size, shape and scale of the pieces I am making. The swage lines on the back half of the helmet were done using a cheap bead roller from ebay. I still have the ear pieces, range finder and visor to make but will update the post when they are done.
The torso armour was also made using thewizardoflight's templates, although I shaped the back armour incorrectly so I'll reshape that before paint. I also have yet to make the gauntlets and jetpack but I have templates for those. For the chest display I bought a cheap programmable LED display with scrolling message on ebay, although I left the default message on there as it already looks like an alien language when its divided by the top and bottom window (it reads "Welcome" in Chinese). I gave the torso and shoulder armour some curvature using a metal roller and the English wheel, no hammering required.
Anyway hope this is of some help to someone looking to make their own armour. I wouldn't have done it without the inspiration from goldpointprops' video on youtube so thanks to him.
I'm happy to answer questions and give help where I can if anyone wants to ask anything.
I'll update when I finish the helmet and have made the jetpack and gauntlets.
