Hoble Revo 13 internal float removal

Hi

I am trying to install a GT90 track behind the seat on the left side.  There is black float inside the yak and I am not sure how to remove it so that I can screw in the GT90 track nuts.  IS there a way tpo install the GT90 track without removing the black float?

Also is there a document that shows all the internal parts ( strings, pulleys,etc ) of the revo 13?  I found alot of diagrams for the outback on the hobie site but nothing on revo 13.  I must not be searching correctly.

thanks in advance