I am no glass expert, but my way of thinking would be to trim the scoop so it is as even as possable around the lip, then grind a ridge / dip in the bonnet where you want it located.
Trial fit to be sure it is where you want it located.
Mix some glass resin and apply to both the hollow you have created, and to the lower edge of scoop.
Mate the 2 together, then glass in as required.
Probably be good to also include a sheet or 2 of resin mat to add strength.
Where ever you are adding resin, you will be needing to remove gelcoat.
If you have a hole in the bonnet and can access inside of scoop, you could add more mat here for strength as well.
Now that I have said all that, a glass guy will be along soon to say I told you wrong
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.