Folks,
Responses follow to some of the posts.

Luiz- My original drawings had a central C/B and central rudder. Both were discarded in the interest of simplicity.
It is the mounting of the c/b and rudder that makes them a more complex sollution.

Eric- In response to your specified requirements:-
the boat should be under 150lbs,
car topable and easy breakdown to make car topping even easier.
almost no fittings and with what is there staying on the boat not much could be lost.

TRi x Troll- The prototype will have 60sq ft of sail. Depending on peformance relative to the intended use it may be increased.

Berny- 3 options would be on the cards for a home builder.

Alutz- If the performance is ok would skegs be accepted?

Hans- monkey proof- good point.

Stewart- agreed the main sheet needs to be inside something so it doesn't catch little necks..

Claus- I also considered the Tornado type c/bs- but as i have built a Cobra which uses them I decided against them
as they involved more work and are also heavier not to mention increased production cost.

The way I count the votes:-
Option 1 and 3 have 4 votes each ,
Option 2 has 14 votes and is a clear winner.

A good thing about option 2 is that it would be easy to change the rudders and you have option 1
or via/versa. The spade rudders a very cheap and dead easy to make.

I would like to thank all the parents that commented.
Your feedback is valuable in helping establish what is both desired and required.