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a8 . Great job so far. Have you considered skinning your shell lengthwise. That way if you had access to a tablesaw you cut your kerfs with that. At any rate to get a 3" radius you will need to cut deep enough so that only about 1/4 " of foam remains and for the spacing use freebeards formula. I found that the foam has a slight natural bend to it so you need to use that to your advantage.
The idea in theory is have the spacing so that after bending to the 3" radius the kerfs will will be closed on the inside. I found that in reality that if after bending you have kerf openings they can be filled with epoxy/micro mix and the fiberglass cloth can be layed directly into that mix . On the nose of my camper which is 2" foam bent to a 2 3/4' radius I used this method and it worked great.
If you decide to cut the kerfs on a tablesaw you should make a simple throatplate splitter.I will post a pic later of one I made. Hope this helps
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