Not gonna lie this would have been a lot messier and wasteful had I not used the papercraft object. I still had to get it to fit and also to create pieces I cut off and lost. Very happy with how the jets and power pack fit against the back.
I have pencilled in the edges of the back straps, and there is a corner of the support layer still visible. I’ll keep it but it will be dyed black. In game there is an area under the arms that is so deep in shadow it looks black. This shape is preferable to keep as well for stability when worn- prevents stretching.
So still leather as the bulk of this but I may be using fibreglass to support the back things and also centre front plastron.