I'll throw out a low tech idea for capturing helmet shape: Partially inflate a head-ish sized balloon (choose contrasting color to helmet interior) and put it in the helmet (helmet should be upside down). Use a saucer or other weight to flatten the top of the balloon, filling the helmet to the desired level. Use a tripod, to position a camera above this contraption. Take photo. I think the flattened top surface of the balloon will make it easier to see the internal helmet shape. There's my $.02, but I may owe you change.
July 30, 2021, 5:49 p.m. - WyOh
I'll throw out a low tech idea for capturing helmet shape: Partially inflate a head-ish sized balloon (choose contrasting color to helmet interior) and put it in the helmet (helmet should be upside down). Use a saucer or other weight to flatten the top of the balloon, filling the helmet to the desired level. Use a tripod, to position a camera above this contraption. Take photo. I think the flattened top surface of the balloon will make it easier to see the internal helmet shape. There's my $.02, but I may owe you change.