Hi Scott,
I spent some time researching the Albins option for my car, at the time his transaxles were only really suitable for off road use, they are beautifully made but massive !
He was talking about producing a smaller version that would be suitable for GT40s, I did see some drawings and specs but never persued it any further as I need a minimum production run of 500 to be eligible for Group 2 b racing here in Australia.
His workmanship is well known to be excellent and he is the only person in Australia that is capable of producing all the components in a transaxle "in house".
I would be interested to see the transaxle if he has produced one ... it should be a good box for the circuit.
Iain