Worf, thought I - or someone else - had mentioned Neil Williams' classic Airborne... but if not, what an oversight!
But it's the Cosmic Wind "Ballerina" rather than a Cassutt he describes so fantastically in the book - he campaigned the Cosmic in the World Aeros in 1964. First Cassutts appeared in the UK around 1970ish thanks to Tom Storey. Sorry, Anorak off...
But, what a great book...