It looks like the pin hinges are no longer available, but there are alternative configurations. I’ll dig up a few and post them here. Good question to make sticky!
Hint: one great idea is to omit hinges altogether and go with a tight fitting “hatch” secured with standard window latches. You’ll need to fit two evenly spaced handles to “pull the hatch” when the keg is empty.
I found some cool latches at this website: http://www.kennedyhardware.com/
They also have some hinges, but only with an offset of 3/8″ Ideally I’d like 1/2″ or more but can’t find them. Could you tell me the place you got your hinges?
Thanks,
Baz