That reminds me of a n offer from Eric Fradet. Eric is/was the technical director for the Federation Francais du Parachutisme and he wrote a 600 page manual about modern parachutes (up to 2013 and maybe even more recently as he often updates his manual electronically). Eric invited me to proof-read the French-language original and then offered me the opportunity to translate the manual into English. At the time, I was too busy to start translating a book that long.
Would it be worth my time now that I am semi-retired from skydiving?