Clean it all up and remove any burrs to make a neat hole with ( important ) rounded corners.
Chamfer all the edges of both skins and build up your laminate from the hull...use plasticene or similar neatly covered in cling film as a bridge while you laminate the deck skin up to a millimetre shy of the outer skin level.
Find an un damaged laser and take a mould of the bow with either - a two part rubber mould ( expensive ) or mould putty modelling clay plasticene or whatever ( thoroughly wax the intact laser bow first eh )..
Once your laminates are cured brush gelcoat into the mould and position it.
This sounds all very easy but it's a brief description, each segment carries it's own bunch of things to do - prep, amounts, forethought in clamping/ holding etc etc..
Depends how much you love your boat regarding the depth of effort, I've seen folk just squirt in tubes of outdoor silicone in there and carry on, very ugly but moderately effective.
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