Sounds like you have the right guys on the job. It's very hard to find a place that will take care of you, even harder to find someone who can mock up parts of another model and make them work as they should on yours, many mechanics are just parts replacers.
My helpers are a lot cheaper per hr lol.
When you look at the cost of getting and processing firewood there isn't a lot of profit there unless you are focusing on it solely.
The customer I delivered to today asked me if I could cut up a walnut tree top from a nice sized walnut she sold. The guy who bought it said they would take care of all the brush and cut up all the firewood, they took the stem and left
. I told her I could but it would cost just as much as buying a seasoned cord delivered, then I asked her if her son was going to split it(he suggested she ask me to cut it up), she said I hadn't thought of that. I'll probably buck it up this fall so it can dry out a bit and then load the rounds onto the trailer and split off the trailer right into her woodshed for spring next season, I'll ask her son remove the rubbish left over.