Hi Jim,
Have you seen
this link yet? Scanning through it, aside from armor, cuir bouillii was used much as plastic is today, so there were canteens, knife and sword sheaths, jack boots, boxes, and such made out of various versions of boiled leather.
Apparently, it's a common armor material in SCA, so there actually is a living community out there who knows something about how it works for armor. Good stuff.
Best,
F