Make sure to wear a dust mask. I was sanding my project without wearing
a mask consistently and got it into my lungs and triggered an asthma
problem for a year. AND dont rub your eyes with your dusty hands - my
face got swollen one time really bad. The epoxy/fiberglass dust is
worse than the epoxy mixing fumes. Otherwise the fiberglass dust is no
problem.

You can easily trim excess cured fiberglass while it is relatively soft
and not 100% cured.
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SQ2000 canard: http://www.abri.com/sq2000/