I thought he was tall, but holy cow, Walken is 6'4". And considering Cushing is only a few inches taller than carrie fisher, who is 5'1", I would have a big problem if he played Tarkin, unless he was digitally shortened. I would say Cushing was no more than 5'6" which would leave a 10 inch discrepancy between the 2! That's a little much IMO.