Sure: key idea is pages are documents. Each page contains a JSON blob which specifies the blocks it's made up of and the content for each block. Each block is just a module with a schema specifying the data it takes and an associated template and a render function. Rendering a page is a URL resolution -> Controller -> DB lookup for the page -> pass the block list to a master render function and done.
The thing some people don't realise is EEx is compiled to a function call, which means no string interpolation, regex whatever. Getting a bunch of HTML is just a function call.
