Update 14:
So as I said in the previous post i was able to enlist the help of a nerd by Imperial citizen who filmed me wearing the helmet which helped me workout what was flexing.
So after watching the video it turned out it was the unsecured rear parts that were flexing, so I was able to fix them into position by using some Chicago screws that wound up being to long for use on the belt to secure the loose parts to each other and tighten up the whole rig.
It does seem a little on the large side but I'm fine with that because I reckon once I get the bodysuit and chest armour going it'll fill out the look.
So the next thing on the list is to fix the height issue, at this stage I find it's riding a bit low (although an onlooker would never known and I can still see fine and you would never know if the lenses were fitted). So I thinking I'm going to use that foam/insulation tape that some use to pad their shins, can't remember the name at the moment but I'm sure you know. That should lift it a a tad and allow me to see easier.
Also 'warning' for weird disembodied eyes. I look pretty weird with the bucket on and with my eye line sitting that tad higher.
One more thing, I will still be cleaning up the rear a bit so it's not so ugly, I know that no one will ever see it but that kind of thing matters to me!
First some pictures of the new set up:
And now some quick pics with the Bucket on. Beware the scary eyes!!! (mind you I could have posted a much scarier photo that had the flash going and I had my eyes closed, that was was an instant delete thats for sure!)
I'm also in the middle of redoing the front of the dome since with the combination of painting layers from me and the previous owner the lines in running across the centre axis of the front to the back had lost their detail. A bit more sanding an it'll be ready to go again.