I am in favor of this mod.
actually, it looks like you could combine it with counter-sunk screws to hide the lower nut, and both protect your typing surface as well as give the case a "cleaner" look.
Since I type in my lap, my current plan is more nearly to grab a hunk of 2"x4" and balance the halves on it, still on my lap. I'm sure everyone here will hear how that turns out.