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Dan Schaefer has a good point on drilling holes in the spar web. It's
something to be done with a lot of examination (if done).

To minimize problems, make sure to drill your hole(s) in the center of the
web, away from the spar caps (Cutting the spar cap = death). You could
probably taper reinforce the area around the hole with tapered 45° layups to
get some of your shear strength back. It might be a good idea to contact a
professional composite/aircraft engineering to have a look at all the
variables and it should cost very little.

(2nd member of the certified chickens)
Scott Dahlgren

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