On that notch fill piece... Just bevel about 6" all around it, pretty much down to the new core depth-wise. Then lam enough to bring it just about level (leave a bit for fairing compound/primer). Large to small on the glass... Take some visqueen and lay it over and trace that as a pattern
Inner skin: 4x1708 is about standard (1700 if epoxy). Do a nice 8-12" tab into the hull though. 2oz of resin wets out a sq foot of 1708 so you can gauge and not have much waste. Or weigh the glass and mix up the same amount of resin by volume. Keep that roller wet!
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