SimGuruTaterTot has a good idea of building the world from ground up! I might do the same thing!
Pretty much standard procedure here I will play it in default for a little to get a feel for the building style/theme then my inner-ocd-child will escape from its cage and force me to gut the entire world and rebuild it all from scratch
Only wish we had a better variety of lot sizes with the in-game editing tools
Totally agree with the lot sizes! EA loves using the 30x40 lot, but we don't have that option with in-game editing. I love moving the community lots around to better suit how I want the world to look. It's always so difficult to do. Then I see a home I like, but rats, it's on a 30x40 lot which means I'd have to lay down a 40x40 to use it. That takes up too much precious flat land area, so I rarely do it.
Inge over at Simbology has a mod that you can add custom lot sizes to your game. It requires a bit of editing with Sim3PE, but it isn't very hard.