The C6 all vennered.  Now for the bit I have been dreading, preparing the rebates...... After much soul searching and deliberation I decided to try and use a small "Dremel" tool fitted with a sanding wheel to finish the rebates.  When done with a very slow speed to control the amount of waste that is removed this proved to be suprisingly easy and effective.
The finished rebates!
The C6 ready for painting / finishing