I agree with the key points made earlier in the thread. There is no reason to use the internal throwout bearing; the Kirkham unit is easy to set up and serviceable. I am running Avon tires and they work extremely well with the chassis. They have great grip and track well in a straight line. I really like the TKO600. I would look at the
oil cooler as an insurance policy, and with braided lines should not represent a reliability concern. I don't know why you wouldn't want the mini-starter. They work great, weigh less, and give a little more working room in a very tight engine compartment. Plus, brushless DC motors are just awesome technology. The decision of hydraulic vs mechanical for the cam & rollers is a personal choice of how you want to spend your time, how technically true to the original you want to be, and how high you want to rev. I went hydraulic to give me more time to play with other things.
I love my Kirkham; it is one of the best cars I have ever owned. Jamo once described his as "perfect", and that about sums it up. Have fun.
Mark