HAHAHHAHAHAA
Good luck wt=ith this idea
try finding klids willing to pick rocks these days, and considering most places might have several tons per acre(could do about 3 ton an acre in my area )
I'd love to see kids do an acre here and HOW Much $$ would it cost me if I could find any

maybe a small 1/4 acre plot its a do able thing, but even still, kids today are NOT that type of physical labor willing to work from MY experience
I did this a few times in the early 90's hiring kids from local football teams, figured they would get a great work out and there coach was a friend of mine who hleped get them hired, but, wasn't cheap and well, they didn;t do that great a job

better off hiring a real company that does this type of work, or local farmer with correct tools to do so!

kids these days, WAY too lazy and would want a fortune to do if if even so! IMO
good idea on paper.or a screen though LOL