Not bad...atoll -- I mean, at all.
It could be crescent-shaped against the worst wave action (or circular, with an opening).
Still, that location would require more rock-fill as a basis to put progressively finer rock and gravel before the sand was finally put in.
The funds could come from any new developer's
Environmental Impact "fees". (Fees like those collected in other states with rapidly growing populations.)
Now...where could New Hampshire acquire rock, I'm wondering?