I like the dedication :) However, just to keep your sanity: you don't really need to use only Park Pods for maximum happiness. All houses other than the basic House have an upgrade (or multiple) boosting them to 100 happiness, normally involving computer chips. The Modern Rustic Home also needs to be adjacent to three other rustic homes/parks for that.
This all doesn't mean a city with only Park Pods wouldn't be cool and interesting, of course. :)