Making the holes a little bit larger on the fuselage side will be a
little bit of a trick only to keep the hole centered on where the
original hole center was. There is plenty of "meat" and opening the
hole up is not going to affect the stregth of the part on the fuse side.

Actually, not that hard. Secret modelers trick is to oversize the
hole, make new backing plates. Put a precise size hole in the backing
plate, assemble glider, get wings true in place and glue plate in
place. Instead of glue you may need to hit it with a tig welder just
to tack it. Then disassemble glider and secure further. We use epoxy
of course for models.

Darren "U2"