Which marine plywood?

A good supplier near me has the following. From best to worst, please rate them for the following applications. I have a good cabinet maker who will do the cutting of the scarf angles. All 1/4". Some will be 10'--12'--16'. Ash, White, quartered A1---------Mahogany, Honduras, flat cut A1---------Mahogany, Philippine, Ribbon Stripe A1--------Same, but rotary cut-----------------Mahogany,Occume (Morroco). ---------------These will be used for the bottom skins with frames and stringers forming 12" x 12" boxes on the bottom. All edges will also have 1" x 1" triangular gussets glued from the edges to the bottom skins.----------------Side frames are 12" apart. They will also have 1" triangular gussetts glued for support full length. Engine floor same. Main deck same. I am sure the boat structure will survive a roll with ease. ------------ The boat is 20' x 4.0' @ WL and 5' at the deck x 3.5' deep at the bow, with a reverse sheer. Transom is 2.5' deep. I can scan the plans to someone if they know how to post them. Thanks for any help at this point of the construction.

 

It is a 2 seat runabout, probably 800# of hull. 700# of engine. 300# of V drive equipment. 100# of "stuff". and 180# of gasoline. A Gentleman's Racer.

 

Shelman makes a very good Okoume plywood, BS1088, Lloyds serticate, 15 or 25 years warranty, fungicide in the glue.

Se this discussion, Shelmarine vs Bruynzeel:
http://www.woodenboat-ubb.com/cgi-bin/UBB/ultimatebb.cgi?ubb=get_topic&f=1&t=010227&p=