Pattern help needed

Hi there, i'm making a new spacesuit back pack and while i've got the 'pattern' laid out in Fusion360 and a physical unit make up in backing board (see images) , i now need help turning this into a pattern that i can get sewn up here in the UK or a test toil made. The inside will be foam so it'll be somewhat of and case that's to be filled.

I have all the measurements, and rather than make it out of the fewest cuts, i need each panel to be sewn to the other so it keeps it's shape and to differentiate the parts of the tank.

I can separate all these parts out if that helps, but i have no idea how to design seem lines or connection points, or how to instruct on specific sewing joins. This is where i'd like the help.

I can only upload 3 images here but obviously have a-lot more of the physical item and the digital item. I can separate them into individual panels if this helps.