Damier Venice vs Sac Plat-Differences?

I would love a Sac Plat with a zipper too:P . By looking at the Sac Plat, it's really structured on the top edges so I don't think you can add a zipper, moreover you won't want to alter/repair any LV yourself other than LV as they won't touch it once it's been altered/repaired by someone else.:s