https://www.amazon.co.uk/gp/product/0854299769/ref=dbs_a_def...
The original donor car was (I think) a Mk3 Ford Escort, obviously they are a collectors car now.
There have been a number of revisions now, it's published by Haynes the publisher of many car repair manuals. There is also a whole network of small business selling parts, you can buy ready made chassis and body panels for them.
I was gifted the book in the late 90s as a teenager, always planed to one day build one. And the fact the house I bought a few years ago has a garage with an inspection pit is only making it more tempting.