Whereas on Zeit Now the root of the website can be a web server written in multiple languages, and offer the ability to make your own "Lambda Builder" if necessary https://zeit.co/docs/v2/deployments/builders/overview
You can rewrite URLs to serve the main website as well. We're generally bullish on but DJing server side rendering, but a rule like this totally works:
Whereas on Zeit Now the root of the website can be a web server written in multiple languages, and offer the ability to make your own "Lambda Builder" if necessary https://zeit.co/docs/v2/deployments/builders/overview