I did this in 1/4" redwood benderboard. It was only to establish the curves and separation point so I use few and thin strips. If you stacked up the 3 1/2" boards and tapered them all together and then 'glassed the whole thing it would look like a canoe.
There would be a lot of edge gluing, but maybe you could lay it up dry and then pull the glass cloth taut before you resin it.