Not sure of the source for the later armoured seat but here’s some more images of the BF’s chair and various head/armour plates from various sources that might help:

[ATTACH=CONFIG]235088[/ATTACH][ATTACH=CONFIG]235089[/ATTACH][ATTACH=CONFIG]235090[/ATTACH][ATTACH=CONFIG]235091[/ATTACH][ATTACH=CONFIG]235093[/ATTACH][ATTACH=CONFIG]235095[/ATTACH][ATTACH=CONFIG]235092[/ATTACH][ATTACH=CONFIG]235094[/ATTACH][ATTACH=CONFIG]235096[/ATTACH][ATTACH=CONFIG]235097[/ATTACH]