I'd love to give my kids projects. Problem is I've got two kids with completely different needs.
My oldest is five, can follow instructions very well, is highly intelligent. He taught himself to read (has some trouble with numbers though). I actually like having him help out.
My middle child will turn three in Sept., but has some learning disadvantages. His total vocabulary comes to about fifteen words. If I have him around when I'm working, *nothing* gets done, because I'm chasing him around making sure he doesn't kill himself on something.