I know another who did similar, very good machinery operator and went carpentering as gf not impressed with his hours of workJust had a good young lad leave. Turned 21 and decided to go off to be a Carpenter.
We had put him through various tests, Trailer, Chainsaw etc.
Was well paid, last full year almost £24k, probably averaged 45 hours a week, but plenty of time off in the winter.
If it doesn't work out for him I have said he can come back anytime, however I fear it is unlikely.
Do have a young lad who is going to College but really need someone with more skills to take the pressure off everyone else. Not many livestock contractors, but at least we don't have to buy expensive pieces of kit!