Nope, it's a full-featured trial (just with a time limit).
There is built in support for embedding HTML within rapidweaver in regular Rapidweaver (no stack required). 'Add > HTML Code' and 'Add > IFrame' are both suitable for inserting Hype content.
That's correct -- if you can share what you have that would be great to see an example.
I've made a quick update to our Rapidweaver tutorial with new screenshots, but the workflow is pretty similar: Embedding within a Rapidweaver project