Allowing for the helmet I mounted the gimbals with extended visor mounts made of 0.015 thousandths sheet styrene. As I don't really have a plan for the cockpit, chin or gullet piece all this is subject to change but at least now I understand how the cheek pieces work with the gimbals.
I suppose the best thing is to cut the helmet to see where it falls in relation to the ears (gimbals) and the amount of clearance required to allow the head to lower and raise.
Somehow I managed to guess right which moving part eclipses which and for that I am grateful.
Later on this evening I'll cut the helmet but I need to relax a bit after this thoroughly draining exercise in design. Martini Time!!!!!
"It is easier to deceive people than it is to convince them that they have been deceived."