I've had my morning Cardo. Because of the size of the apron slab I had the wood store give me a true edge with the other rough. The slab was too big to get both edges true with the wood store equipment and I sure as hell didn't want to wrestle it around the table saw or band saw by myself for either edge.
Because of the rough edge I installed the apron with the true edge down and I left the rough edge up with between 1mm to 6mm exposed above the top of the bench. Can you say thank you woodworking gods for the wood stock scrub plane I acquired so many years ago. It was fairly short work with the scrub plane to get it down to needing the #5 with heavy camber and then to the #8 to finish it up. sitting here typing, sweating like a pig, and my body screaming No Mas No Mas, I can say it was "fairly short work" and it was. I just need to do it more often.....the machines will do that to you.
Anyway, the apron is installed all that is left is to drill the dog holes. I've laid out three vertical rows between the legs that will be supplemented by two row of angled holes running from the bottom to the top and I expect I will add a fourth vertical row on the other side of the right leg.