Steve,
Put the bit to it and let her fly !!
The bit will go through the glass so fast, that there won't be enough
heat to do any damage to the surrounding areas.

This is a no brainer !!

Just be sure to drill the holes a little smaller than needed, as the
glass will tend to spread a little when sticking those screws or
whatever fastener intended, and won't hold very good.

If at all possible through-bolt, and nut the items to be attached, and
use washers for sure----fiberglass is brittle, and has very little
holding power.

Later,

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Terry
74 Campmobile (Clementine)
85 GL
86 BMW 325 ES