What exactly do you mean by WP-esque functionality, though? If by blog platform, then yes, that's easily done with Rails. And quick too. E-commerce? That's going to take more than 40 hours. WP is notoriously bloated and multi-purpose (not in the good way--in the square peg, round hole way). Really, the only WP functionality that would be tough to replicate in Rails is the WP theme/plugin ecosystem, but that's not really Rails' style--and if you need that, why not just use WP?