Here are some shots I took of a popular Tornado cascade setup from a few years back:

Cascade1 Cascade3
Cascade2

The internals are depicted in this diagram from Macca:

Cascade Diagram

I've been wanting to do this on my boat for some time...main issue is the Marstrom boom width will not handle the recommended internal double blocks. Either need to swap out the boom with a wider section like used on Tigers or start experimenting with homemade blocks that can fit the width dimension.