I heard on the Cricut Boards that you can use the Cuttlebug Extended Plates in the Fuse System. It worked, I used both B plates with Sizzix Big Die and it went through nice and smooth. I also used the plateform and B plates and an Embossing Folder and that worked too.
The next thing I want to try is the C plate and Spellbinders Nestabilities. Will keep you updated.