Not if you have a little patience. Are you building the bows or showing the kids to build their own? I think they would lose interest quickly and move on to something else if you have them build their own. Not to mention they may not pay attention to detail like they should.
If you want to help Scouts make bows you should look at the Boy scouts and then only help the ones who show interest. That would cut down on the throwing about of tools
If you were building them for a local cub scout group, I have seen some packs as large as 80 kids in which case you have some work cut out for you.
If you wanted to focus on one den (smaller group of kids, Usually 3-10) and help these kids every year as they enter Weblows or their Bear/Wolf Rank, It would be not only more achievable but you could give the kids a quick building lesson that is a little hands on with all aspects of building bows. They then can have a meeting where they decorate their own bows and maybe even paint and shoot them.
Any way you hack it, it would be an ambitious but rewarding venture. Good for you entertaining such a worthy cause.
Good Luck and let us know how you make out.