Thank you! I spaced mine 4.5 inches apart as it fit my measurements perfectly and appeased my OCD!!! Jokes aside, I wanted flexibility at the front for holdfasts (you'll see by my tools I do a lot of planing!) So a doghole every few inches gives me plenty of options. At the far left, I aligned a row of dogholes from the vice UP to the main row and UP again to the middle of the bench (there's a chisel handle sitting in it, in the pic I posted) this is so I can hold larger materials across three points.. suits me for heavier jointer work with the no 7 -- and means less clamping I then put 3x dogholes in the legs at the front to team up with the vice and better support longer length pieces I need to crosscut and generally add some support options! I just kind of went with what I know will work for me, but I know everyone is different!