-
Don't get me wrong, router jigs are great but it's overkill in this instance and will still need to be finished off with a sander.
@Soul is starting off with a relatively flat surface backed with an almost completely flat base so there is no need, but if it were a rustic and wide butcher block worktop that had been poorly glued, or a live edge slab for a table, then it would definitely be an option.
Out of curiosity given your near pathological hatred of wooden worksurfaces why are you watching YouTube videos about how to make them?
I’ve got an electric planer and a random orbital.
What’s going to be better to get this flat with? There are 0.5-1mm differences all over the thing.