60000 psi Nanopowder Concrete / Regular Concrete was 5000 psi

If you have plywood for making double sided molds, why not just use that plywood to build the boat?

It would be a lot easier to convince immigrants to board a wood boat than a concrete one anyway.

BTW, are these immigrants trying to get "in to" or "out of" of Turkey?

 

You can go for a smaller boat: 1998 Tom Mc Nally made an incomplete crossing with a "boat" of 3ft and 11inch (47,24in) which means 119,88cm or ~ 1,20m (http://www.microcruising.com/famoussmallboats.htm) Some sort of modern torture.



For me the most interesting designs for ocean crossings with small boats are from the swedish sailor Sven Lundin (Yrvind). Here is his newest project: http://www.yrvind.com/present_project/
http://www.yrvind.com/boat_ideal/wp-content/uploads/2014/06/2014-06-06_180553.jpg