: I'm looking to make at least 6 boats for my kids & their teen
: group.
: It has to be super simple to build and 'mass-produce'.
: I built a Yost Kidarka for my daughter, but she can't get in there
: anymore.
: The kids love paddling all over the place in my bigger boats, but I
: want something they can start learning to roll in, and paddle on
: into early adult.
I would build a mix. A couple Sea Pups for the smaller paddlers and maybe a Sea Rider or another longer boat for the larger paddlers. If you want stable boats look towards a wider beam. My daughter is a roller and loves her Sea Rider. I kept is at a bare minimum width of 18". I would go with the standard 19" for new paddlers.
Remember these are kids. They will love anything that paddles. Having a mized fleet will give more variety and let them experience the possibilities. If you do happen to get a boy or two to paddle be sure to put them in the least stable boat so they can show off their wet exiting skills. :)
My daughter loves nothing more than to rescue a flipped over boy. :D