I've decided I'm just not going to accept the slightly undersized holes in the RV-12 kit. So I disassembled things and used #30 reamer to enlarge holes ever so slightly. There's nothing good that can come from jamming an LP-4 into an undersized hole and they ARE undersized as can easily be ascertained by attempting to put a rivet into the skin hole with no mating involved.
Of course this involves times, so I got virtually nothing done except for the leading edges on the top side of the right skin.