Normal layup varies from just the plywood (quite normal), to reinforced with glass on both out and inside.
I buildt a Quattro 16 (Richard Woods design) reinforced with 200gram glass on just the outside. The Houlton ply-Tornados was reinforced with 90gram on inside and 250gram glass on the outside (ref: http://www.thebeachcats.com/modules...ile=index&req=viewdownload&cid=6 ) (not sure if it was 90 on the inside, need to check the plans).
I heard the numbers for the F-18 Blade as well, but I dont remember them now. But it was quite overbuildt to make it achieve class minimum weight, this also made it quite a bit stiffer as well. 135gram and 300gram springs to mind, but I am very unsure about these numbers.

I am totally depending on my long-term memory now, but I seem to remember that Marstrøm uses a 250gram layup on the outside of his Tornado hulls. Dont remember the inside, but I'll try to find out where I read this. He mixes several types of foam, nomex honeycomb, pre-pregs, glue-films etc. in his boats, and autoclaves them to achieve his quality criteria. If you want to go that far, you can probably get more information about this from Kevin Cook who frequents this forum.

After re-reading what I just wrote, I realise that I have a terribly bad head for remembering numbers
Hope it's somewhat useful anyway..

If you want to really test the material, you can always take a sledge-axe to them (the axe you have reserved for the really stubborn, knotty and cross-grained firewood). Not very scientific, but probably very satisfying if the hulls survives (Warning: might help you find out if it's repairable as well)

Hope you will post some results after the tests are done on your website!