I'm stuck at work and can't log in, so I've been playing with the plot template spreadsheet I found in another thread here. How accurate is that? I'm having some problems.

Currently I have a 51x51 plot and in-game I can line up 9 Tier 2 silos across the top edge, with a little room on each end. In the spreadsheet though, I can only fit 7 across.

Are the footprints in that template accurate? Or is there a better offline plot planner out there?