Top glue-ups are always the hairiest part of any project I do. This is particularly maddening since the degree of difficulty is pretty low on any of the three or four operations I need to perform, but get one wrong and I'm up for hours of hair-pulling. So, as I start the assembly of Gilberte's top, I keep a few of my own rules in mind:
5/4" stock is only marginally more expensive than 4/4" and it gives me more room to play. Unless I really want a dead-on 3/4" top (In which case go for the 4/4" as I don't want to awaken the internal stress monsters by removing massive amounts of stock) I let the exact thickness be determined by the way the wood is working.
Verifying the alignment of jointer knives
12 hours ago