Not a bad idea, if you don't want to use, or don't have, a planer
sleds. But, if I was gonna try something like this I'd probably just
clamp a couple of pieces of 2X4 in place, rather than going to the
bother of making something dedicated; cause if you didn't use it a lot,
it'd mostly just gather dust and take up space - and you'd probably have
to track it down if you ever wanted to use it again.
Justice was invented by the innocent.
Mercy and lawyers were invented by the guilty.