Yet another in my string of silly questions...

I'm assuming it's possible, but what is the generally accepted way to put a skeleton butt on a throughbolt gun? I'm assuming something like this happens on a fairly regular basis even with non-throughbolt guns in order to balance the gun by drilling out the stock a bit...is the center of the plate a "false" piece of wood (i.e. not a part of the actual stock) in order to cover up the hole? Or is the hole alone plugged? If so, it seems like either would have to be very thin...is it fragile?

Is putting one of these on a throughbolt gun akin to putting lipstick on a pig?

Thanks,
Dave