Having sat through several meetings of my region's junior program organizational meetings.

A couple of points. Junior regattas are one day in the middle of the week. It's moms who have to get the kid's boat off the car or trailer, Weight is a HUGE concern.
They have coaching programs for parents on HOW to safely tie down and trailer the Opti!

For the Yacht Clubs... space becomes limited with 30 opti's and 20 lasers, 10 420's and now 10 cats. going out a small launch area. getting them up and down into the water must be EASY.

We have tried Junior divisions at adult cat races... Its had limited success... Better luck with a junior only cat races.

Your mileage will vary

Mark.